Plains Store LA009

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

CWSAC description
Early in the morning of May 21, 1863, Maj. Gen. Christopher C. Augur's Union division advanced from Baton Rouge toward the intersection of Plains Store and Bayou Sara roads on the way to secure a landing, on the river, for Maj. Gen. Nathaniel Banks. Col. Benjamin H. Grierson's cavalry, in the lead, encountered Confederate forces under the command of Col. Frank P. Powers and skirmishing ensued. As the morning progressed the Union infantry approached the crossroads and came under fire, bringing on a general engagement. At noon, Col. W.R. Miles set out for Plains Store with Confederate reinforcements. By the time that Miles arrived in the area late in the day, the fighting had ceased, the Rebel forces had retreated, and the Federals were preparing camps for the night. Miles attacked the Union forces and, at first, drove them, but they regrouped and counterattacked. Miles could not stand against the overwhelming Union force and retired into the Port Hudson perimeter. The battle ended, and the last Confederate escape route from Port Hudson was closed.

Command responsibility (ledger v2)

US: Christopher C. Augur

Grade A under rule 2; echelon division. superior_directing

Augur marched his division, led by Grierson's cavalry, to the crossroads on May 21 and deployed it against Miles (Irwin; description). Grierson's cavalry made first contact under Augur: subordinate context (rule 2, grade A). Banks had ordered the march to the rear of Port Hudson (superior_directing: Banks).

Major General
arnold-cwsac-commanders, battle LA009, belligerent US, fullname Christopher C. Augur; column rank · snapshot 6c587c298717…
Augur marched toward the
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…
Thus the affair was really ended before Augur, whose duty it was to act with prudence, had time to com- plete the proper development of his division
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…
Maj. Gen. Christopher C. Augur's Union division advanced from Baton Rouge
arnold-cwsac-battles, battle LA009; column description · snapshot 952b5d08402a…

Confederate: Frank P. Powers

Grade A under rule 3a; echelon detachment_or_post. superior_directing

Other candidates: William R. Miles

Both listed colonels tie on rank. The description and Irwin put the detachment first engaged under Powers (rule 3(a)). Miles's legion went out later, on Gardner's orders, and attacked after Powers's force had retreated; no inspected passage says Miles took command of Powers's detachment, so no command change is recorded. Irwin's 'S. P. Powers' differs from the listing's 'Frank P. Powers'; identity rests on the description; Irwin's colonel is linked by the event, not the name. Irwin says Miles's sortie 'brought on the action known as the battle of Plains Store', a different framing from the description's sequence, but in both the first contact of the day is Powers's detachment. Gardner sent Miles out (superior_directing: Gardner).

Colonel
arnold-cwsac-commanders, battle LA009, belligerent Confederate, fullname Frank P. Powers; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle LA009, belligerent Confederate, fullname William R. Miles; column rank · snapshot 6c587c298717…
Col. Benjamin H. Grierson's cavalry, in the lead, encountered Confederate forces under the command of Col. Frank P. Powers and skirmishing ensued.
arnold-cwsac-battles, battle LA009; column description · snapshot 952b5d08402a…
his advance fell in with a detachment of the garrison under Colo- nel S. P. Powers of the 14th Arkansas regiment,
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…
This brought on the action known as the battle of Plains Store.
irwin-port-hudson-selections-v1 · snapshot a13f05b8a601…

Side strength (ledger v3)

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

whole_engagement_leakage

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

whole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
cs-milesbound400unknownlowerpartial_scopedossier claim reported-force-scope
cs-irwin-milesbound400unknownlowerpartial_scopedossier 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 . Claims are extraction records with their quoted passages, not historical adjudication. JSON

information

supportedunresolved Miles says he had no means of knowing the enemy's exact number. Irwin says Augur had to deploy as if against the full enemy force, and that no complete reports of the affair were made. NPS says Miles arrived after the first fighting had ceased.

Attributed knowledge from an interested report, a history and a summary; no dispatches inspected.

I have no means of knowing the exact number of the enemy we en- countered.
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
as for a battle with the full force of the enemy, which he was bound to suppose was about to engage him.
irwin-port-hudson-selections-v1, p.162 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
no complete reports of the affair were made and the regimental narratives are meagre.
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
By the time that Miles arrived in the area late in the day, the fighting had ceased,
nps-la009-v1, Description · snapshot feca405dc267…

logistics

supportedunresolved Miles says he brought off 23 of his wounded, all he could furnish transportation for. No other supply statement was found in the inspected passages.

One statement from an interested report; not a return.

bringing off 23 of my wounded, this being all I could furnish transportation for.
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…

objectives

supportedunresolved Irwin says Augur marched to seize the enemy's line of retreat at the crossing of the Plains Store and Bayou Sara roads and open the way for Banks, and that Gardner sent Miles to feel Augur's advance and perhaps drive it away; NPS says Augur was securing a landing for Banks. Miles says he moved out under orders.

Stated aims from a history, a summary and an interested report.

to seize the enemy's line of retreat and to open the way for Banks.
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
to feel Augur's advance and perhaps to drive it away.
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
on the way to secure a landing, on the river, for Maj. Gen. Nathaniel Banks.
nps-la009-v1, Description · snapshot feca405dc267…
I moved out yesterday on the Plains road, in obedience to orders.
or26-1-miles-port-hudson-selections-v1, pp.167–168 (OCR page markers; not checked against print) · snapshot d0aee729401a…

outcome

supportedpost_outcome The frozen result reads Union victory and the live result Union Victory. Miles says Boone's fire let him withdraw at leisure and in good order; Irwin says it enabled Miles to retire behind the breastworks. NPS says the last escape route was closed.

Retain the original result and engagement interval; later movements and campaign contribution are different measures. No new probabilities or individual causal credit. The closing of the investment is campaign context.

Union victory
arnold-cwsac-battles, battle LA009; column results_text · snapshot 952b5d08402a…
Union Victory
nps-la009-v1, Results · snapshot feca405dc267…
enabling me to withdraw the command at leisure and in good order,
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
enabled Miles to draw off and retire behind the breastworks.
irwin-port-hudson-selections-v1, p.162 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
the last Confederate escape route from Port Hudson was closed.
nps-la009-v1, Description · snapshot feca405dc267…

disputedpost_outcome The frozen casualty text reads 250 total (US 150; CS 100), and the live field agrees. Irwin gives the Union loss as 15 killed, 3 officers and 69 men wounded and 25 missing (102). Miles reports 89 killed, wounded and missing, knowing only of 8 killed and 23 wounded, and says the enemy reported burying 40 of his dead; Irwin also cites a surgeon's return of 12 killed and 36 wounded at Plains Store.

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.

250 total (US 150; CS 100)
arnold-cwsac-battles, battle LA009; column casualties_text · snapshot 952b5d08402a…
250 total (US 150; CS 100;)
nps-la009-v1, Estimated Casualties · snapshot feca405dc267…
The total casualties were 15 men killed, 3 officers and 69 men wounded, and 25 men missing — in all, 102.
irwin-port-hudson-selections-v1, p.162 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Our loss in killed, wounded, and missing is 89.
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
I only know of 8 killed and 23 wounded.
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
The enemy, however, report having buried 40 of our dead,
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
Nor does this total include the losses at Plains Store, which, according to the surgeon's return, were 12 killed and 36 wounded,
irwin-port-hudson-selections-v1, p.234 (OCR page markers; not checked against print) · snapshot a13f05b8a601…

responsibility

supportedunresolved Irwin says Grierson's advance met a detachment under Colonel S. P. Powers of the 14th Arkansas, and that Dudley and Chapin supported Augur's guns; Miles ordered a section of Boone's battery forward to rake the Union flank. The frozen commanders are Colonel Frank P. Powers, Colonel William R. Miles and Major General Christopher C. Augur; the live page lists Augur and Frank Powers.

Command roles from a history and an interested report; Powers's initials differ between Irwin and the frozen record, and the listed commanders do not receive automatic sole credit.

Colo- nel S. P. Powers of the 14th Arkansas regiment,
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
Dudley, on the right of the road that leads from Plains Store to Port Hudson, supporting Holcomb's guns, and Chapin on the left supporting Rawles's guns.
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
I at once ordered a section of Captain [R. M.] Boone’s battery to advance up the Plains Store road,
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
Col. Benjamin H. Grierson's cavalry, in the lead, encountered Confederate forces under the command of Col. Frank P. Powers
nps-la009-v1, Description · snapshot feca405dc267…
Colonel
arnold-cwsac-commanders, battle LA009, belligerent Confederate, fullname Frank P. Powers; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle LA009, belligerent Confederate, fullname William R. Miles; column rank · snapshot 6c587c298717…
Major General
arnold-cwsac-commanders, battle LA009, belligerent US, fullname Christopher C. Augur; column rank · snapshot 6c587c298717…
Colonel Frank Powers [CS]
nps-la009-v1, Principal Commanders · snapshot feca405dc267…

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.

supportedunresolved The frozen force field reads 1st Division, XIX Army Corps and Cavalry Brigade [US] and a small combined infantry, artillery and cavalry force [CS]; the live field reads zero. Miles says he moved out with 400 infantry and a battery, and that prisoners put the enemy at fifteen regiments besides artillery and a large cavalry force; Irwin gives Miles's battalion as about 400 with Boone's battery and lists Augur's brigades, squadron and batteries without numbers.

Confederate detachment figures from an interested report and a history that follows it; no Union count. None is adopted as a matched opening strength. The live zero is not measured absence.

1st Division, XIX Army Corps and Cavalry Brigade [US]; small combined infantry, artillery, and cavalry force [CS]
arnold-cwsac-battles, battle LA009; column forces_text · snapshot 952b5d08402a…
0 total (US 0; CS 0;)
nps-la009-v1, Forces Engaged · snapshot feca405dc267…
With 400 infantry and a battery of my command,
or26-1-miles-port-hudson-selections-v1, p.167 (OCR page markers; not checked against print) · snapshot d0aee729401a…
the prisoners captured by us stating it to consist of fifteen regi- ments of infantry, besides artillery and a large cavalry force.
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…
Gard- ner sent out Miles, with his battalion, about 400 strong, and Boone's battery,
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
With Augur now were Dudley, Chapin, Grierson,
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…

terrain

supportedunresolved Irwin says Grierson met the Confederates at the wood bounding the plain and that Miles met Augur in the heavy forest masking the crossroads; NPS places the objective at the intersection of the Plains Store and Bayou Sara roads. Miles says his skirmishers found the Union infantry near Plains Store.

Ground described by a history, a summary and an interested report; no map verification.

When Grierson came to the edge of the wood that forms the southern boundary of the plain,
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
In the heavy forest that then masked the cross- roads and formed the western border of the plain,
irwin-port-hudson-selections-v1, p.161 (OCR page markers; not checked against print) · snapshot a13f05b8a601…
toward the intersection of Plains Store and Bayou Sara roads
nps-la009-v1, Description · snapshot feca405dc267…
until near Plains Store, where my skirmishers found the enemy’s infantry with some artillery,
or26-1-miles-port-hudson-selections-v1, p.168 (OCR page markers; not checked against print) · snapshot d0aee729401a…

Open questions