Port Hudson LA010

1863-05-21 to 1863-07-09 · LA · Siege of Port Hudson [May-July 1863] · frozen result: Union · NPS summary (as listed)

CWSAC description
In cooperation with Maj. Gen. Ulysses S. Grant's offensive against Vicksburg, Union Maj. Gen. Nathaniel P. Banks's army moved against the Confederate stronghold at Port Hudson on the Mississippi River. On May 27, after their frontal assaults were repulsed, the Federals settled into a siege which lasted for 48 days. Banks renewed his assaults on June 14 but the defenders successfully repelled them. On July 9, 1863, after hearing of the fall of Vicksburg, the Confederate garrison of Port Hudson surrendered, opening the Mississippi River to Union navigation from its source to New Orleans.

Command responsibility (ledger v2)

US: Nathaniel P. Banks

Grade A under rule 2; echelon army.

Irwin has Banks commanding the besieging army: he placed Weitzel over the right wing and ordered the May 27 assault; Plains Store (May 21, the record's start date) was fought by Augur's division on Banks's orders (LA009). Rule 2, grade A.

Major General
arnold-cwsac-commanders, battle LA010, belligerent US, fullname Nathaniel P. Banks; column rank · snapshot 6c587c298717…
Banks now placed Weitzel in command of the right wing of the army,
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…
Accordingly, as soon as the council broke up he gave orders for an assault on the following morning.
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…

Confederate: Franklin Gardner

Grade A under rule 2; echelon detachment_or_post.

Irwin has Gardner commanding the garrison: he summoned his commanders to council and surrendered it. The detachments engaged on May 21 were the garrison's (LA009). Miles's support of Beall on May 27 without orders is subordinate context (rule 2, grade A).

Major General
arnold-cwsac-commanders, battle LA010, belligerent Confederate, fullname Franklin Gardner; column rank · snapshot 6c587c298717…
Gardner summoned his commanders to meet liim in council.
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…
Gardner himself tendered his sword to Andrews,
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…

Side strength (ledger v3)

US: grade B, 20,000 (17,000–23,000)

basis_mixedderivation_unknownsingle_inputwhole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
us-lv-may27bound13,000reported_effectivelowerpartial_intervalpost_engagement_state
Banks's command, effectives 13,000
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
us-lv-june14bound6,000unknownpartial_scopepost_engagement_state
Columns of attack, about 6,000
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
us-irwin-capbound17,000reported_effectiveupperone_sided_bounddossier claim reported-force-scope
us-irwin-12000bound12,000reported_effectiveone_sided_boundpartial_scopedossier claim reported-force-scope
us-irwin-endbound8,000reported_effectiveone_sided_boundpartial_scopepost_engagement_statedossier claim reported-force-scope
us-clodfelterB20,000unknownderivation_unknown
20000
arnold-clodfelter-forces, battle_id Port Hudson (siege), belligerent US; column strength · snapshot 96430f3626d3…

Confederate: grade C, 4,330 (3,030–9,100)

applicability_unresolvedbasis_mixedcompiled_dependencewhole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
cs-lv-may19C4,326reported_effectivescope_unresolved
estimated at 93 per cent. of present for duty May 19 [1] 4,326
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
cs-lv-may27bound4,192reported_effectivelowerderived_from_lossespartial_interval
Deduct losses May 22-26 134 [c] 4,192
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
cs-lv-june14-pfdbound3,750present_for_dutylowerderived_from_lossespartial_intervalpost_engagement_state
Present for duty in Gardiner's command, June 14, estimated at [3] 3,750
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
cs-lv-june14-effbound3,487reported_effectivelowerderived_from_lossespartial_intervalpost_engagement_state
Effectives estimated at 93 per cent. 3,487
livermore-transcription-v2, p.101 (page image livermore-p101-image-v1) · snapshot 688ea7363f1b…
cs-irwin-7000C7,000unknowninterval_unresolveddossier claim reported-force-scope
cs-marchC16,287present_for_dutyengagement_link_unknowndossier claim reported-force-scope
cs-prisonersC6,340unknownpost_engagement_statedossier claim reported-force-scope
cs-miles-julybound400unknownone_sided_boundpartial_scopepost_engagement_statedossier claim reported-force-scope

Nested records

ContainingContainedOutcomeReason
Port Hudson LA010Plains Store LA009nestedPort Hudson's frozen interval begins on May 21, the date of Plains Store. Its frozen force field (XIX Army Corps and the Confederate forces of the 3rd District at Port Hudson) includes the forces of the contained record: Augur's 1st Division, XIX Corps, and a detachment of the Port Hudson garrison under Powers, with Miles's legion sent out by Gardner. So the containing record's force scope includes LA009 (rule 7, as for VA032/VA034). The LA010 description does not narrate Plains Store, and the dossiers keep its losses separate; that is a casualty-accounting choice, not the force scope.

Dossier claims

Draft dossier, revision port-hudson-review-correction-2026-09-25. Claims are extraction records with their quoted passages, not historical adjudication. JSON

information

supportedunresolved Irwin says no minutes were kept of the council before May 27, no time was fixed to make the attacks simultaneous, and no division could see another. Miles on July 7 took the Union cheering over Vicksburg's fall for fictitious news; Irwin says Gardner then asked for official assurance that Vicksburg had surrendered.

Attributed knowledge from a history and an interested report; no order books or signal logs inspected.

No minutes of this council were kept, and to this day its conclusions are a matter of dispute.
irwin-port-hudson-selections-v1, p.167 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
It will be observed that no time was fixed for the assault of either column nor any provision made to render the several attacks simultaneous.
irwin-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
On no part of the line was either divi- sion in sight of the other.
irwin-port-hudson-selections-v1, p.169 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
My own impression is that some fictitious good news has been given to his troops in order to raise their spirits
or26-1-miles-port-hudson-selections-v1, p.177 (OCR page markers; not checked against print) · snapshot d0aee729401a…
it was found to contain a request for an official assurance as to the truth of the report that Vicksburg had surrendered.
irwin-port-hudson-selections-v1, p.228 (OCR page markers; not checked against print) · snapshot a13f05b8a601…

logistics

supportedunresolved Irwin says the Confederate commanders had to husband a scanty store of ammunition, that the Union surgeons' supplies were exceeded on May 27, that the animals went on half or quarter rations of grain after July 3, and that the starving garrison had to be fed after the surrender. Miles says his men were worked and fought without rest day or night.

Supply statements from a history and an interested report; not returns.

the necessity of husljanding their scanty store of ammunition
irwin-port-hudson-selections-v1, p.169 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
who soon found their preparations and supplies exceeded by the unlooked-for demand upon them.
irwin-port-hudson-selections-v1, p.181 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
all the animals went upon half or quarter rations of grain, with little hay or none.
irwin-port-hudson-selections-v1, p.218 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
it was necessary that the starving garrison should be fed.
irwin-port-hudson-selections-v1, p.229 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
who are worked and fought without rest day or night,
or26-1-miles-port-hudson-selections-v1, p.177 (OCR page markers; not checked against print) · snapshot d0aee729401a…

objectives

supportedunresolved Irwin says Pemberton ordered Gardner to hold the place to the last while Johnston ordered its evacuation too late, and that Banks's council judged prompt action demanded; Banks's June summons demanded surrender to avoid unnecessary slaughter, and Gardner declined. Miles wrote on July 6 that he would hold his line as long as a man stood up.

Stated aims from a history (quoting the summons and reply) and an interested report.

he was met by an order from Pemberton to return to Port Hudson with a few thousand men and to hold the place to the last.
irwin-port-hudson-selections-v1, p.165 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
ordered Gardner to evacuate Port Hud- son and to march on Jackson, Mississippi.
irwin-port-hudson-selections-v1, p.165 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
The general opinion was, however, that prompt and decisive action was demanded
irwin-port-hudson-selections-v1, p.167 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
I desire to avoid unnecessary slaughter, and I therefore demand the immediate surrender of the
irwin-port-hudson-selections-v1, pp.193–194 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
My duty requires me to defend this position, and therefore I decHne to surrender.
irwin-port-hudson-selections-v1, p.194 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
1 will hold my line as long as a man stands up
or26-1-miles-port-hudson-selections-v1, p.177 (OCR page markers; not checked against print) · snapshot d0aee729401a…

outcome

supportedpost_outcome The frozen result reads Union victory and the live result Union Victory. Irwin calls the June 14 attack a bloody repulse and the terms an unconditional surrender; he quotes Gardner as willing to surrender having defended the place as long as duty required. NPS says the garrison surrendered on July 9 after hearing of Vicksburg's fall.

Retain the original result and engagement interval; later movements and campaign contribution are different measures. No new probabilities or individual causal credit. The repulsed assaults of May 27 and June 14 are phases of this record; the surrender is its end.

Union victory
arnold-cwsac-battles, battle LA010; column results_text · snapshot 952b5d08402a…
Union Victory
nps-la010-v1, Results · snapshot 506a57a7a603…
The result of the day may be summed up as a bloody repulse ;
irwin-port-hudson-selections-v1, p.201 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
were those of an unconditional surren- der.
irwin-port-hudson-selections-v1, p.231 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Having defended this position as long as I deem my duty- requires, I am willing to surrender to you,
irwin-port-hudson-selections-v1, p.229 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
On July 9, 1863, after hearing of the fall of Vicksburg, the Confederate garrison of Port Hudson surrendered,
nps-la010-v1, Description · snapshot 506a57a7a603…

disputedpost_outcome The frozen casualty text reads 12,208 total (US 5,000; CS 7,208); the live field reads 17500 total (US 10000; CS 7500). Irwin gives Union losses of 1,995 on May 27, 1,805 on June 14 and 4,363 for the siege, and says at least as many more were sick. He cites a partial undated Confederate surgeon's return of 176 killed and 447 wounded (623), excluding Plains Store, and Jackson's report of 200 killed, 300-400 wounded and 200 dead of sickness; Beall's brigade lost 358 to June 1. Miles reports 4 killed and 11 wounded on his line on June 14. The garrison surrendered 6,340 prisoners.

Original casualty returns were not inspected; preserve totals, categories, cutoffs and differences. No canonical reconciliation or casualty-based opening count; related actions must not be added without resolving population overlap. The frozen and live totals differ widely; their basis is not stated. That they include the surrendered garrison is an inference from their size, not a stated fact. Sick are not battle casualties.

12,208 total (US 5,000; CS 7,208)
arnold-cwsac-battles, battle LA010; column casualties_text · snapshot 952b5d08402a…
17500 total (US 10000; CS 7500;)
nps-la010-v1, Estimated Casualties · snapshot 506a57a7a603…
making the total killed 293, total wounded 1,545. total missing 157, and an aggregate of 1,995.
irwin-port-hudson-selections-v1, p.181 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
thus making a total of 216 killed, 1,401 wounded, 188 missing — in all, 1 ,805.
irwin-port-hudson-selections-v1, p.201 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
The total losses of the Corps during the siege were 45 officers and 663 men killed, 191 officers and 3,145 men wounded, 12 officers and 307 men captured or missing ; in all, 4,363.
irwin-port-hudson-selections-v1, p.233 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
At least as many more were sick in the hospitals,
irwin-port-hudson-selections-v1, p.216 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
A partial return, without date, signed by the chief surgeon, shows 176 killed, 447 wounded, total 623.
irwin-port-hudson-selections-v1, p.234 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
the total casualties during the siege were 200 killed, between 300 and 400 wounded, and 2CX:) died from sickness.
irwin-port-hudson-selections-v1, p.234 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
In Beall's brigade all the losses up to the 1st of June numbered 68 killed, 194 wounded, and 96 missing; together, 35S ;
irwin-port-hudson-selections-v1, p.182 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
The casualties of the day are 4 killed and 11 wounded.
or26-1-miles-port-hudson-selections-v1, p.175 (OCR page markers; not checked against print) · snapshot d0aee729401a…

responsibility

supportedunresolved Irwin says Banks ordered the May 27 assault after the council, put Weitzel over the right wing, and resolved to replace T. W. Sherman when his division had not attacked by noon; Grover and Weitzel agreed to wait before renewing the attack. Miles says he sent support to Beall on May 27 without waiting for orders. Irwin says Gardner summoned his commanders to a council ("That evening"; the selected passage does not give the date) and tendered his sword at the surrender. The frozen commanders are Major Generals Franklin Gardner and Nathaniel P. Banks, as on the live page.

Command roles from a history and an interested report; the listed commanders do not receive automatic sole credit.

Accordingly, as soon as the council broke up he gave orders for an assault on the following morning.
irwin-port-hudson-selections-v1, p.167 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Banks now placed Weitzel in command of the right wing of the army,
irwin-port-hudson-selections-v1, p.166 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Banks returned to his headquarters determined to replace Sherman by the chief-of-staff of the department.
irwin-port-hudson-selections-v1, p.177 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Grover gave Weitzel the counsel of prudence, and Weitzel fell in with these views.
irwin-port-hudson-selections-v1, p.175 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Without waiting / for official notification, I at once pushed forward to his support every man I could spare.
or26-1-miles-port-hudson-selections-v1, p.169 (OCR page markers; not checked against print) · snapshot d0aee729401a…
That evening; Gardner summoned his commanders to meet liim in council.
irwin-port-hudson-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Gardner himself tendered his sword to Andrews,
irwin-port-hudson-selections-v1, p.232 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Major General
arnold-cwsac-commanders, battle LA010, belligerent Confederate, fullname Franklin Gardner; column rank · snapshot 6c587c298717…
Major General
arnold-cwsac-commanders, battle LA010, belligerent US, fullname Nathaniel P. Banks; column rank · snapshot 6c587c298717…

strength

unknownunresolved

No inspected return establishes matched personnel at a common opening boundary. The frozen side-specific numerical strength bounds are blank (missing_numeric_strength). No figure in this pass is adopted as a simultaneous opening force.

disputedunresolved The frozen force field reads XIX Army Corps, Army of the Gulf [US] and the Confederate forces of the 3rd District at Port Hudson [CS]; the live field reads zero. Irwin says Gardner held the place with about seven thousand of all arms after the garrison of 16,287 present for duty at the end of March had been drawn on for Vicksburg; that the besiegers outnumbered the garrison rather more than two to one on May 26; that the besiegers' effective strength never exceeded 17,000, with less than 12,000 available for the siege and hardly 8,000 effective outside the cavalry at the end; and that 6,340 prisoners were taken. His footnote on the besiegers' strength says the Union monthly and tri-monthly returns for May and June simply carry March forward. Miles says on July 6 that he had less than 400 muskets for over a mile and a half of breastworks.

Figures for different dates, bases and scopes from a history and an interested report; the prisoner count is a post-surrender figure and not an opening strength. None is adopted as a matched opening strength. The live zero is not measured absence.

XIX Army Corps, Army of the Gulf [US]; Confederate forces, 3rd District, Department of Mississippi and East Louisiana, Port Hudson [CS]
arnold-cwsac-battles, battle LA010; column forces_text · snapshot 952b5d08402a…
0 total (US 0; CS 0;)
nps-la010-v1, Forces Engaged · snapshot 506a57a7a603…
Port Hudson was now held by Gardner with a force of about seven thousand of all arms.
irwin-port-hudson-selections-v1, p.163 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
At the end of March the garrison consisted of 1,366 officers, 14,921 men of all arms present for duty, making a total of 16,287.
irwin-port-hudson-selections-v1, p.164 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
thus Rust and Buford marched to the relief of Vicksburg on the 4th of May,
irwin-port-hudson-selections-v1, p.164 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
they out- numbered the Confederates rather more than two to one.
irwin-port-hudson-selections-v1, p.167 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
The effective strength of all arms had at no time exceeded 17,000.^
irwin-port-hudson-selections-v1, p.216 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Of these less than 12,000 can be regarded as available for any duty directly connected
irwin-port-hudson-selections-v1, p.216 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
These returns are, however, simply the returns for March carried forward,
irwin-port-hudson-selections-v1, p.216 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
When the end came at last the effective force, outside of the cavalry, hardly exceeded 8,000,
irwin-port-hudson-selections-v1, p.217 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
With the place were taken 6,340 prisoners of war, of whom 405 were officers and 5,935 enlisted men.
irwin-port-hudson-selections-v1, p.233 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
This leaves me with less than 400 muskets to defend over 1J miles of breastworks.
or26-1-miles-port-hudson-selections-v1, p.176 (OCR page markers; not checked against print) · snapshot d0aee729401a…

terrain

supportedunresolved Irwin says the works ran four and a half miles in a semicircle from the river below the town to the swamp above, over ravines, plantation fields and gullies, in country covered with heavy magnolia forest; the woods came within 250 yards of the works on Weitzel's front and 1,200 on Sherman's, and felled timber made a formidable obstruction on Augur's approach.

Ground described by a history; no map verification. The works and felled timber predate the assaults, but their state on each day is not established, so the phase is left unresolved.

the lines were four and a half mi](-s long, and ran in a semicircular sweep from the river near Ross Landing, below Port Hudson, to the impassable swamp above.
irwin-port-hudson-selections-v1, p.163 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
nearly the whole country was covered with a heavy growth of magnolia trees of great size and beauty.
irwin-port-hudson-selections-v1, p.164 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
The forest approached within 250 yards at the nearest point on Weitzel's front,
irwin-port-hudson-selections-v1, p.169 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
the timber had been recently felled, and, lying thick upon the ground, made a truly formidable obstruction.
irwin-port-hudson-selections-v1, p.169 (OCR page markers; not checked against print) · snapshot a13f05b8a601…

Open questions