Fort Pulaski GA001

1862-04-10 to 1862-04-11 · GA · Operations Against Fort Pulaski [April 1862] · frozen result: Union · NPS summary (as listed)

CWSAC description
Fort Pulaski, built by the U.S. Army before the war, is located near the mouth of the Savannah River, blocking upriver access to Savannah. Fortifications such as Pulaski, called third system forts, were considered invincible, but the new technology of rifled artillery changed that. On February 19, 1862, Brig. Gen. Thomas W. Sherman ordered Captain Quincy A. Gillmore, an engineer officer, to take charge of the investment force and begin the bombardment and capture of the fort. Gillmore emplaced artillery on the mainland southeast of the fort and began the bombardment on April 10 after Colonel Charles H. Olmstead refused to surrender the fort. Within hours, Gillmore's rifled artillery had breached the southeast scarp of the fort, and he continued to exploit it. Some of his shells began to damage the traverse shielding the magazine in the northwest bastion. Realizing that if the magazine exploded the fort would be seriously damaged and the garrison would suffer severe casualties, Olmstead surrendered after 2:00 pm on April 11.

Command responsibility (ledger v2)

US: Quincy A. Gillmore

Grade A under rule 3a; echelon detachment_or_post. superior_directing

Other candidates: David Hunter

Hunter (Major General) and Gillmore (Captain), both army. Gillmore was charged 'in the double capacity of engineer and commander of the forces' with the offensive operations on Tybee Island (Gillmore; Jones agrees), and the description has him beginning the bombardment on April 10 (rule 3(a)). Hunter, commanding the department, arrived on Tybee with Benham the evening before the bombardment and sent the summons on the morning of the 10th (superior_directing: Hunter). Gillmore's account of the opening says only 'The order was given to open fire', so who gave it is not stated; that and Hunter's presence are recorded, not treated as a contradiction. Benham (district commander, also present) is not listed. The choice does not rest on rank: by listed rank Hunter (Major General) outranks Gillmore (Captain), and rule 3(b) would apply only if no passage decided the side.

Major General
arnold-cwsac-commanders, battle GA001, belligerent US, fullname David Hunter; column rank · snapshot 6c587c298717…
Captain
arnold-cwsac-commanders, battle GA001, belligerent US, fullname Quincy A. Gillmore; column rank · snapshot 6c587c298717…
In the double capacity of engineer and commander of the forces I was charged with the offensive operations on Tybee Island,
or6-gillmore-fort-pulaski-selections-v1 · snapshot 8925d3ad7807…
Captain Gillmore was given the rank of Brigadier General of Volunteers, and charged with the task of reducing Fort Pulaski.
jones-fort-pulaski-selections-v1 · snapshot b7a900174718…
Brig. Gen. Thomas W. Sherman ordered Captain Quincy A. Gillmore, an engineer officer, to take charge of the investment force
arnold-cwsac-battles, battle GA001; column description · snapshot 952b5d08402a…
Gillmore emplaced artillery on the mainland southeast of the fort and began the bombardment on April 10
arnold-cwsac-battles, battle GA001; column description · snapshot 952b5d08402a…

Confederate: Charles H. Olmstead

Grade A under rule 2; echelon detachment_or_post.

A cited passage states the command: the description has Olmstead refuse the summons and surrender the fort. No inspected passage by Olmstead describes his decisions (dossier).

Colonel
arnold-cwsac-commanders, battle GA001, belligerent Confederate, fullname Charles H. Olmstead; column rank · snapshot 6c587c298717…
after Colonel Charles H. Olmstead refused to surrender the fort
arnold-cwsac-battles, battle GA001; column description · snapshot 952b5d08402a…
Olmstead surrendered after 2:00 pm on April 11
arnold-cwsac-battles, battle GA001; column description · snapshot 952b5d08402a…

Side strength (ledger v3)

US: grade D: no usable figure (modelled in the rating runs)

whole_engagement_leakage

Confederate: grade B, 390 (330–700)

applicability_unresolvedderivation_unknownwhole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
cs-gillmore-700C700unknownadversary_or_hearsay_estimateengagement_link_unknowndossier claim reported-force-scope
cs-gillmore-385C385unknownpost_engagement_statedossier claim reported-force-scope
cs-jones-385B385unknownderivation_unknowndossier claim reported-force-scope

Dossier claims

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

information

supportedunresolved Gillmore says the positions of the five most advanced batteries were screened from the fort little by little, that subsequent inquiry showed the defenders knew the exact position of only two batteries, and that messengers passed between the fort and the interior over the marshes.

What the defenders knew is inferred afterward by the besieging commander; no Confederate report was inspected (the volume's report list includes Pemberton's and Lawton's reports, which were not inspected; no report by Olmstead is listed).

The positions selected for the five most advanced batteries were artificially screened from view from the fort
or6-gillmore-fort-pulaski-selections-v1, p.155 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Subsequent inquiry showed that he knew the exact position of only two of our batteries — Sherman and Burnside.
or6-gillmore-fort-pulaski-selections-v1, p.158 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
It was known that messen- gers passed to and from the fort in this way quite frequently.
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…

logistics

supportedunresolved Gillmore says ordnance was landed without a wharf on an exposed beach, that 250 men could hardly move a 13-inch mortar on a sling-cart, and that each battery had a service magazine for about two days' firing, with a depot magazine of 3,600 barrels. He dates the absolute blockade of the fort from February 22 but says it proved impossible to isolate it perfectly. Jones says that before the end of February the force in Lazaretto Creek, with the batteries on Venus Point and Bird Island, 'effectually isolated' Pulaski, and that the fort would necessarily have had to surrender through starvation once its provisions were consumed.

Besieger's labor and supply arrangements, and a historian's inference about the garrison's provisions; no garrison return or supply inventory inspected. Jones's 'effectually isolated' and Gillmore's statement that perfect isolation proved impossible (messengers passed over the marshes) differ; Jones follows Gillmore's report and is not independent of it.

The labor of landing the heaviest ordnance, with large supplies of ordnance stores, without a wharf, upon an open and exposed beach
or6-gillmore-fort-pulaski-selections-v1, p.145 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
250 men could hardly move a 13-inch mortar loaded on a sling-cart.
or6-gillmore-fort-pulaski-selections-v1, p.146 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Each battery had a service magazine capable of containing a supply of powder for about two days^ firing.
or6-gillmore-fort-pulaski-selections-v1, p.155 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
A depot powder magazine of 3,600 barrels’ capacity was constructed near the Martello Tower,
or6-gillmore-fort-pulaski-selections-v1, p.155 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The absolute blockade of Pulaski dates from the 22d of February,
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
It was found impossilde to perfectly isolate the work.
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
in conjunction with the batteries on Venus Point and Bird Island, effectually isolated Pulaski.
jones-fort-pulaski-selections-v1, p.81 (OCR page markers; not checked against print) · snapshot b7a900174718…
It would necessarily have had to surrender through starvation when the supply of provisions should be consumed;
jones-fort-pulaski-selections-v1, p.81 (OCR page markers; not checked against print) · snapshot b7a900174718…

objectives

supportedunresolved Gillmore reported in December 1861 that reduction by mortar and rifled-gun batteries on Tybee was practicable; the breach was ordered in the scarp so as to take the magazine in reverse; after the first day he concluded the fort would have to be reduced by breaching, perhaps ending in an assault.

Stated plan and intent in the besieger's reports.

I deemed the reduction of that work practicable by batteries of mortars and rifled guns established on Tybee Island.
or6-gillmore-fort-pulaski-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The breach had l)een ordered in this portion of the scarp so as to take in reverse through the opening the magazine
or6-gillmore-fort-pulaski-selections-v1, p.145 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
that upon breaching alone ending perhaps in an assault, we must depend for the reduction of the work.
or6-gillmore-fort-pulaski-selections-v1, p.158 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…

outcome

supportedpost_outcome The frozen and live results read Union victory. Gillmore says that after a first day's fire had begun a breach, the fort hoisted the white flag at 2 o'clock on the 11th; Jones says the fort, with its armament and garrison, was surrendered at 2 P.M.; NPS says Olmstead surrendered after 2:00 pm on April 11.

Retain the original result and engagement interval; later movements and campaign contribution are different measures. No new probabilities or individual causal credit.

Union victory
arnold-cwsac-battles, battle GA001; column results_text · snapshot 952b5d08402a…
Union Victory
nps-ga001-v1, Results · snapshot 19353189acc8…
when the fort hoisted the white flag. This occurred at 2 o’clock.
or6-gillmore-fort-pulaski-selections-v1, p.159 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
the white flag was run up over the fort, which, with its armament and garrison, was surrendered to the Union forces.
jones-fort-pulaski-selections-v1, p.84 (OCR page markers; not checked against print) · snapshot b7a900174718…
Olmstead surrendered after 2:00 pm on April 11.
nps-ga001-v1, Description · snapshot 19353189acc8…

disputedpost_outcome The frozen casualty text reads 365 total (US 1; CS 364); the live field reads 2 total (US 1; CS 1). Gillmore reports one Union man killed and says several of the garrison were severely and one fatally wounded; his 385-man garrison count describes the surrendered garrison, not a casualty return.

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 CS 364 and the live CS 1 differ by an unstated population (possibly captured garrison against battle casualties; neither basis is stated).

365 total (US 1; CS 364)
arnold-cwsac-battles, battle GA001; column casualties_text · snapshot 952b5d08402a…
2 total (US 1; CS 1;)
nps-ga001-v1, Estimated Casualties · snapshot 19353189acc8…
Several of them were severely, and one fatally, wounded. Our total loss was 1 man killed.
or6-gillmore-fort-pulaski-selections-v1, p.159 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…

responsibility

supportedunresolved Gillmore says he was charged, as engineer and commander of the forces, with the offensive operations on Tybee; Hunter assumed command of the department on March 31, inspected the works without change, and sent the summons on April 10. Jones says Gillmore was given the rank of brigadier general of volunteers and charged with reducing the fort, and that Hunter arrived in time to demand the surrender. The frozen commanders are Major General David Hunter and Captain Quincy A. Gillmore (US) and Colonel Charles H. Olmstead (CS); the live page lists Hunter and Olmstead only. No inspected passage by Olmstead describes his decisions.

Command roles from an interested report and a derivative history; no listed commander receives automatic sole credit. Gillmore's rank is recorded as Captain in the frozen row and as brigadier general in Jones.

In the double capacity of engineer and commander of the forces I was charged with the offensive operations on Tybee Island,
or6-gillmore-fort-pulaski-selections-v1, p.148 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
On the 31st day of March Maior-General Hunter assumed command of the Department of the South,
or6-gillmore-fort-pulaski-selections-v1, p.156 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
No change or modification of any of the works was suggested by either.
or6-gillmore-fort-pulaski-selections-v1, p.156 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Maj. Gen. David Hun- ter, commanding the department, dispatched Lieut. J. H. Wilson, of the Topographical Engineers, to Fort Pulaski, bearing a flag of truce and a summons to surrender.
or6-gillmore-fort-pulaski-selections-v1, p.157 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Captain Gillmore was given the rank of Brigadier General of Volunteers, and charged with the task of reducing Fort Pulaski.
jones-fort-pulaski-selections-v1, p.80 (OCR page markers; not checked against print) · snapshot b7a900174718…
was on Tybee Island in time to demand the surrender of Fort Pulaski,
jones-fort-pulaski-selections-v1, p.86 (OCR page markers; not checked against print) · snapshot b7a900174718…
Major General
arnold-cwsac-commanders, battle GA001, belligerent US, fullname David Hunter; column rank · snapshot 6c587c298717…
Captain
arnold-cwsac-commanders, battle GA001, belligerent US, fullname Quincy A. Gillmore; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle GA001, belligerent Confederate, fullname Charles H. Olmstead; column rank · snapshot 6c587c298717…
Colonel Charles Olmstead [CS]
nps-ga001-v1, Principal Commanders · snapshot 19353189acc8…

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 names the Port Royal Expeditionary Force's investment troops and the fort garrison; the live field reads zero. Gillmore's December 1, 1861 reconnaissance letter, reprinted in his 1865 report, estimated 'probably' 700 good troops in the fort. His 1865 report says the garrison was found at the surrender to consist of 385 men including a full complement of officers; Jones gives five companies of the First Georgia, aggregate strength 385, under Olmstead. For the Union side Gillmore names the Seventh Connecticut, the Forty-sixth New York, two companies of volunteer engineers, two companies of the Third Rhode Island Artillery and an engineer detachment, without numbers. Armament also differs: the fort contained 48 guns, 20 bearing on Tybee (Gillmore 1865), or mounted 46 with twenty of the heaviest bearing (Jones); the Union batteries held thirty-six pieces (Gillmore 1862, Jones) or '30 pieces' as the 1865 report reads in OCR.

A pre-siege estimate four months earlier, a surrender-time count and unit lists. Jones's 385 matches Gillmore's and is not independent. None is adopted as a matched opening strength. The live zero is not measured absence; the frozen bounds are blank. The '30 pieces' reading of the 1865 report conflicts with its own itemized battery table in the same section (Batteries Stanton through Totten list 3+3+3+3+1+3+2+4+6+4+4 = 36 pieces, a computation from the listed rows); the OCR figure is preserved but is probably a misreading, not an independent count.

The Port Royal Expeditionary Force's Fort Pulaski investment troops [US]; Fort Pulaski Garrison [CS]
arnold-cwsac-battles, battle GA001; column forces_text · snapshot 952b5d08402a…
0 total (US 0; CS 0;)
nps-ga001-v1, Forces Engaged · snapshot 19353189acc8…
There are now probably at Fort Pulaski 700 good troops.
or6-gillmore-fort-pulaski-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The garrison of the fort was found to consist of 385 men, including a full complement of officers.
or6-gillmore-fort-pulaski-selections-v1, p.159 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The fort was garrisoned by five companies of the First Georgia Regiment, — aggregate strength 385 — Col- onel Charles H. Olmstead commanding.
jones-fort-pulaski-selections-v1, p.83 (OCR page markers; not checked against print) · snapshot b7a900174718…
The troops who participated in all the heavy labor were the Forty-sixth New York Volunteers, Col. Eudolph Rosa; the Seventh Connecticut Volunteers, Col. Alfred H. Terry ;
or6-gillmore-fort-pulaski-selections-v1, p.146 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
At the time of the siege it contained 48 guns, of which 20 bore upon the batteries on Tybee,
or6-gillmore-fort-pulaski-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
At the time of the bombardment it mounted 46 guns,
jones-fort-pulaski-selections-v1, p.83 (OCR page markers; not checked against print) · snapshot b7a900174718…
There were eleven batteries mounting thirty- six guns,
jones-fort-pulaski-selections-v1, p.82 (OCR page markers; not checked against print) · snapshot b7a900174718…
Twenty of the heaviest of the guns bore on the Tybee Island batteries.
jones-fort-pulaski-selections-v1, p.83 (OCR page markers; not checked against print) · snapshot b7a900174718…
twenty- two of the thirty-six pieces comprised in the batteries were served during the action by the troo])s who had performed the fatiguing labors
or6-gillmore-fort-pulaski-selections-v1, p.146 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The armament comprised 30 pieces, distributed in eleven batterie's,
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…

terrain

supportedunresolved Gillmore describes the fort as a casemated brick work of five sides on Cockspur Island, wholly a marsh, and Tybee as mostly a mud marsh whose last mile, holding the seven most advanced batteries, lay low, marshy and in full view of the fort. His eleven batteries stood between 1,650 and 3,400 yards away; Jones gives an average of 1700 yards for the breaching batteries.

Ground and distances from an interested engineer report and a derivative history; no map inspected. The fort is prewar construction; the battery sites were chosen by the besiegers.

Cockspur Island is wholly a marsh,
or6-gillmore-fort-pulaski-selections-v1, p.148 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Fort Pulaski is a brick work of five sides or faces, including the gorge, caseiiiated on all sides,
or6-gillmore-fort-pulaski-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
Tybee Island is mostly a mud marsh, like other marsh islands on this coast.
or6-gillmore-fort-pulaski-selections-v1, p.155 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The last mile of this route, on which the seven most advanced batteries were placed, is low and marshy, lies in full view of Fort Pulaski,
or6-gillmore-fort-pulaski-selections-v1, p.155 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
1. Battery Stanton, three heavy l3-in(‘h mortars, at 3,400 yards.
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
11. Battery Totten, four 10-inch siege mortars, at 1,650 yards.
or6-gillmore-fort-pulaski-selections-v1, p.154 (OCR page markers; not checked against print) · snapshot 8925d3ad7807…
The breaching batteries were at an average distance of 1700 yards from the fort;
jones-fort-pulaski-selections-v1, p.82 (OCR page markers; not checked against print) · snapshot b7a900174718…

Open questions