Fredericktown MO007

1861-10-21 to 1861-10-21 · MO · Operations to Control Missouri [June-October 1861] · frozen result: Union · NPS summary (as listed)

CWSAC description
Two Union columns, one under Col. J.B. Plummer and another under Col. William P. Carlin, advanced on Fredericktown to overtake Brig. Gen. M. Jeff Thompson and his men. On the morning of October 21, Thompson's force left Fredericktown headed south. About twelve miles out, Thompson left his supply train in a secure position and returned toward Fredericktown. He then learned that Union forces had occupied Fredericktown, so Thompson spent the morning attempting to discern the enemy numbers and disposition. Unable to do so, he attacked anyway, around noon. Plummer, with his force and a detachment of Col. William P. Carlin's troops, met the Rebel forces outside town and a two-hour fight ensued. Overwhelming Union forces took their toll, and Thompson's men retreated. Union cavalry pursued. Fredericktown cemented Union control of southeastern Missouri.

Command responsibility (ledger v2)

US: J.B. Plummer

Grade A under rule 3a; echelon unknown. superior_directing

Other candidates: William P. Carlin

Rule 3(a); both listings are colonels. Plummer says he directed the opening of the action, and that Carlin, 'claiming to rank me', came upon the field during the engagement, reported to him for orders because he had commenced the battle, and obeyed his instructions. Grant ordered the expedition (superior_directing: Grant, commanding the District of Southeast Missouri; he was not on the field).

Colonel
arnold-cwsac-commanders, battle MO007, belligerent US, fullname J.B. Plummer; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle MO007, belligerent US, fullname William P. Carlin; column rank · snapshot 6c587c298717…
Colonel Carlin, though exhausted by a long night's march, and claiming to rank me, came upon the field during the engagement and reported to me in person for orders
or3-plummer-fredericktown-selections-v1 · snapshot c4545c6db4de…
As soon as I arrived at the front I directed Colonel Eoss to move forward his regiment
or3-plummer-fredericktown-selections-v1 · snapshot c4545c6db4de…
Plummer, with his force and a detachment of Col. William P. Carlin's troops, met the Rebel forces outside town
arnold-cwsac-battles, battle MO007; column description · snapshot 952b5d08402a…

Confederate: M. Jeff Thompson

Grade A under rule 2; echelon unknown.

Rule 2, single listing. Thompson reports placing his men and opening the action, and Plummer says Thompson commanded in person on the Confederate right. His dispatches to Polk ask for support but show no superior directing the fight.

Brigadier General
arnold-cwsac-commanders, battle MO007, belligerent Confederate, fullname M. Jeff Thompson; column rank · snapshot 6c587c298717…
Thompson commanded in person
or3-plummer-fredericktown-selections-v1 · snapshot c4545c6db4de…
At 12 o'clock I placed my men in position, and then drove in their pickets.
or3-thompson-fredericktown-selections-v1 · snapshot 4d43035947a6…

Side strength (ledger v3)

US: grade A, 3,000 (2,850–3,150)

basis_mixedcompiled_dependencederivation_unknownsingle_inputwhole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
us-cwA2,500–3,500reported_engagedderivation_unknown
approx. 2,500-3,500
arnold-cwsac-forces, battle MO007, belligerent US; column description · snapshot a462f6be964b…
us-plummer-1500bound1,500unknownlowerpartial_scopedossier claim reported-force-scope
us-plummer-carlin-3000bound3,000unknownlowerpartial_scopedossier claim reported-force-scope
us-thompson-3000C3,000unknownadversary_or_hearsay_estimateengagement_link_unknowndossier claim reported-force-scope

Confederate: grade B, 2,000 (1,700–6,000)

basis_mixedwhole_engagement_leakage

InputClassPrintedBasisBoundCodesPassage
cs-thompson-2000B2,000unknowndossier claim reported-force-scope
cs-plummer-3500C3,500unknownadversary_or_hearsay_estimatedossier claim reported-force-scope
cs-plummer-4000C4,000unknownadversary_or_hearsay_estimatedossier claim reported-force-scope
cs-wounded-6000C6,000unknownadversary_or_hearsay_estimatedossier claim reported-force-scope

Dossier claims

Draft dossier, revision missouri-1861-review-correction-2026-09-25. Claims are extraction records with their quoted passages, not historical adjudication. JSON

information

supportedunresolved Plummer says his message asking Pilot Knob's co-operation fell into Thompson's hands and revealed his intention to attack on Monday; Thompson reports intercepting the courier. Thompson says he spent the morning trying to learn the Union numbers and positions by spies without success.

Both sides describe the same intercepted message; no message log inspected.

which unfortunately fell into the hands of the enemy, and gave them information of my intention to attack them on Monday morning.
or3-plummer-fredericktown-selections-v1, p.207 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
We have intercepted a courier from Colonel Plummer
or3-thompson-fredericktown-selections-v1, p.226 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
I could not possibly learn their number, and wasted the whole morning in endeavoring to find out their number and position by spies, but could not succeed.
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

logistics

supportedunresolved Plummer marched with twelve days' rations and gave up the pursuit with four days' left. Thompson left his train twelve miles south ready to move, and his 12-pounder fired until its trail-chest ammunition was exhausted before being left on the field.

Supply statements from the two reports; not returns.

with rations for twelve days
or3-plummer-fredericktown-selections-v1, p.207 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
having but four days' rations for niy command
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
leaving my train in a condition to move
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
until the ammuniiion in the trail-chest was ex hausted.
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
I left it on the field.
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

objectives

supportedunresolved Plummer took the Dallas road to cut off Thompson's retreat south. Thompson says he marched back to occupy the town and fight whichever Union column appeared first.

Stated aims from the two reports.

for the purpose of cutting off their retreat south should they attempt it.
or3-plummer-fredericktown-selections-v1, p.207 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
for the purpose of occupying the town with my troops alone, and fighting either party that made its appearance first.
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

outcome

disputedpost_outcome The frozen and live results read Union victory. Plummer reports the total defeat and rout of Thompson's force; Thompson's October 22 dispatch to Polk asks for troops because the people 'may be discouraged by my defeat'; his October 23 letter says he was victorious though he fell back before an overwhelming force. Plummer says six or seven buildings in the town were burned afterward.

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 MO007; column results_text · snapshot 952b5d08402a…
Union Victory
nps-mo007-v1, Results · snapshot 1281e0477186…
resulted in the total defeat of Thompson and route of all his forces
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
as they may be discouraged by my defeat.
or3-thompson-fredericktown-selections-v1, p.228 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
(for we were victorious, though we fell
or3-thompson-fredericktown-selections-v1, p.230 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
Six or seven buildings were burned.
or3-plummer-fredericktown-selections-v1, p.209 (OCR page markers; not checked against print) · snapshot c4545c6db4de…

disputedpost_outcome The frozen casualty text reads total unknown (US unknown; CS 62); the live field reads 62 (US 0; CS 62). Plummer reports 6 killed and 60 wounded, 80 prisoners taken on the field (38 wounded; 42 brought back on October 26) and 158 enemy dead buried. Thompson claims three enemy killed for every man he lost and names the loss of Colonel Lowe and his 12-pounder.

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 live US zero is not a measured loss.

Total unknown (US unknown; CS 62)
arnold-cwsac-battles, battle MO007; column casualties_text · snapshot 952b5d08402a…
62 total (US 0; CS 62;)
nps-mo007-v1, Estimated Casualties · snapshot 1281e0477186…
Our loss consisted of 6 killed and 60 wounded.
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
There were taken upon the field 80 prisoners, of whom 38 were wounded
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
I brought with me 42 pris oners
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
One hundred and fifty-eight of their dead were buried by our troops
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
have killed three of their men to every man I lost.
or3-thompson-fredericktown-selections-v1, p.231 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

responsibility

supportedunresolved The frozen commanders are Brigadier General M. Jeff Thompson and Colonels J. B. Plummer and William P. Carlin. Plummer says Carlin, who claimed to rank him, reported to him for orders because Plummer had begun the battle. Plummer says Thompson commanded in person on the right; Thompson ordered the retreat by the right wing.

Command roles from the two reports; no automatic sole credit to the listed commanders.

Brigadier General
arnold-cwsac-commanders, battle MO007, belligerent Confederate, fullname M. Jeff Thompson; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle MO007, belligerent US, fullname J.B. Plummer; column rank · snapshot 6c587c298717…
Colonel
arnold-cwsac-commanders, battle MO007, belligerent US, fullname William P. Carlin; column rank · snapshot 6c587c298717…
Colonel Carlin, though exhausted by a long night's march, and claiming to rank me, came upon the field during the engagement and reported to me in person for orders
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
Thompson commanded in person
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
I ordered a retreat by the right wing
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

strength

unknownunresolved

No inspected return establishes matched personnel at a common opening boundary. Imported numerical estimates remain unchanged; this pass does not validate them as simultaneous opening forces.

disputedunresolved The frozen force field gives the Union a brigade-size force of about 2,500-3,500 (the forces table records 2,500 as both bounds) and the State Guard no figure; the live field reads zero. Plummer says he marched with about 1,500 and found Carlin at Fredericktown with about 3,000, part of whom joined him; he puts Thompson's force at about 3,500 on October 26 and about 4,000 on October 31, some of their wounded saying 6,000. Thompson heard Plummer had 3,000, says the enemy came in more than double his numbers, and calls his own a victorious army of 2,000.

Column sizes and mutual estimates at different dates; no return. The CWSAC range and the table's single value differ. None is adopted as a matched opening strength.

Brigade size force (approx. 2,500-3,500) [US]; Missouri State Guard [CS]
arnold-cwsac-battles, battle MO007; column forces_text · snapshot 952b5d08402a…
2500
arnold-cwsac-forces, battle MO007, belligerent US; column strength_max · snapshot a462f6be964b…
0 total (US 0; CS 0;)
nps-mo007-v1, Forces Engaged · snapshot 1281e0477186…
with about 1,500 men
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
finding there Colonel Carlin, with about 3,000 men
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
consisting of about 3,500 men.
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
The enemy's force was about 4,000 men, though some of their wounded stated it was 6,000.
or3-plummer-fredericktown-selections-v1, p.208 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
(I understand 3,000 men)
or3-thompson-fredericktown-selections-v1, p.226 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
They came, and in more than double our numbers
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…
with a vic torious army of 2,000 men
or3-thompson-fredericktown-selections-v1, p.230 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

terrain

supportedcommander_created Plummer found Thompson about a mile out of town on the Greenville road, with four guns masked on a hill slope about six hundred yards off and the main infantry under Lowe in a cornfield left of the road. Thompson says he placed Lowe's regiment in ambush well in front of his main line.

Positions chosen by Thompson on the day; from the two opposing reports.

occupying a position about 1 mile out of town on the Greenville road
or3-plummer-fredericktown-selections-v1, p.206 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
Their artillery consisted of four pieces, masked upon the slope of a hill about six hundred yards distant.
or3-plummer-fredericktown-selections-v1, p.207 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
The principal body of their infantry, under Colonel Lowe, was posted in the corn field to the left of the road.
or3-plummer-fredericktown-selections-v1, p.207 (OCR page markers; not checked against print) · snapshot c4545c6db4de…
which I had placed in ambush, a considerable distance from our main line
or3-thompson-fredericktown-selections-v1, p.227 (OCR page markers; not checked against print) · snapshot 4d43035947a6…

Open questions