Records say that he was one of five soldiers who left Lyon County, KS in May 1861 who died in The Battle of Wilson's Creek. This seems to be an error because records below mention that he was wounded in action 10 Aug 1861 at Wilson's Creek, MO, and he mustered out on 31 Oct 1861 at Leavenworth, KS.

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The Emporia Weekly News, 08 June 1861, Saturday

The Emporia Guards, under command of Capt. W. F. Cloud, left here two weeks ago for their rendezvous at Lawrence. We had the pleasure of meeting the boys at Burlingame in the evening of the same day they left here. They were in high glee, and we don't believe it will do for an equal number of traitors to face them in a fight. They are the true grit. Under the drill of Capt. Cloud, they will be one of the finest companies in the State. The members hail from different portions of Breckenridge county, and the company is composed of the very best of our young men. Below we give a list of the names of the company. They were afterwards joined by about twenty Burlingame boys:

W. F. Cloud, A. J. Mitchell, A. G. Proctor, C. S. Hills, Jos. A. Fuller, Jos. V. Randolph, Chas. Stotler, Wm.. T. Galliher, W. S. Hunt, Jos. Rickabaugh, H. H. Suttle, Henry Pearce, M. Faucett, Edward Trask, David S. Gilmore, Frank McFadden, Sam. Hammil, Wm. V. Phillips, Chas. A. Archer, Chas Kiger, Wm. B. Tompkins, Lewis Haver, John Clark, M. Meyers, Isaac Gaster, H. Burt, John P. Sleeper, Alpheus J. Heustie (sic), Wm. H. Allen, B.F.W. Perry, Thomas Miller, J. C. Gruwell, William Harvey, Albert Edwards, P. G. Hallberg, Abner Brink, A. S. Broxson, Isaac Denham, J. N. Spencer, G. W. Reed, L. A. Loomis, John Curtis, F. W. Hirth, Frank. Grisey.

We wish the Guards a happy time, and a safe return home. May they fully realize all their glowing anticipations of the pleasures of camp life.

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The Emporia Weekly News, 30 Nov 1861, Saturday

George Reed, of the Emporia Guards, who was severely wounded at Springfield, and was reported dead, has so far recovered as to be able to travel around. We had the pleasure of meeting him at Leavenworth a few days ago. John Clark, of the same company, is dead.

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U.S. Civil War Soldiers, 1861-1865
Name: John Clark
Side: Union
Regiment State/Origin: Kansas
Regiment Name: 2 Kansas Infantry. (3 Months, 1861.)
Regiment Name Expanded: 2nd Regiment, Kansas Infantry (3 months, 1861)
Company: H
Rank In: Private
Rank In Expanded: Private
Rank Out: Private
Rank Out Expanded: Private
Film Number: M542 roll 2

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U.S. Civil War Soldier Records and Profiles
Name: John Clark
Residence: Emporia, Kansas
Enlistment Date: 14 May 1861
Rank at enlistment: Private
State Served: Kansas
Was Wounded?: Yes
Survived the War?: Yes
Service Record: Enlisted in Company H, Kansas 2nd Infantry Regiment on 20 Jun 1861. Mustered out on 31 Oct 1861 at Leavenworth, KS.
Sources: Report of the Adjutant General of the State of Kansas

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American Civil War Soldiers
Name: John Clark
Residence: Emporia, Kansas
Enlistment Date: 14 May 1861
Side Served: Union
State Served: Kansas
Service Record: Enlisted as a Private on 14 May 1861. Enlisted in Company H, 2nd Infantry Regiment Kansas on 20 Jun 1861. Mustered Out Company H, 2nd Infantry Regiment Kansas on 31 Oct 1861 at Leavenworth, KS.
Sources: 72

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Kansas Civil War Soldiers
Name: Clark, John
Rank: Private
Company: H
Section: Infantry
Residence: Emporia
Date Enlst: 14 May 1861
Date Mustr: 20 Jun 1861
Remarks: Mustered out with regiment, October 31, '61; W. in action Aug. 10, '61, at Wilson's Creek, Mo.