The American Research Database, Historical Data Systems in their Regimental Casualty Analysis for the 1st Florida Cavalry list the following for the dates noted:

March 25, 1863 Somerset, KY 1 captured
March 30, 1863 Somerset, KY 5 killed, 8 wounded, 7 captured
March 31, 1863 Somerset, KY 1 killed, 1 captured
http://www.civilwardata.com/active/hdsquery.dll?RegimentCasualty?1097&C&1&41&20

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Troops in the Department of East Tennessee, Brigadier General Daniel S. Donelson, C. S. Army, commanding, March 19, 1863.

Pegram's Brigade (en route to Kentucky).
Brigadier General JOHN PEGRAM.
1st Florida Cavalry (three companies), Capt W. M. Footman.
OR V23 Pt. 2, p. 711

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Numbers 4. Report of Brigadier General John Pegram, C. S. Army, commanding expedition.

HEADQUARTERS CAVALRY BRIGADE,

Near Stigall's Ferry, Ky., April 1, 1863.

SIR: I have the honor to make the following report of the expedition of my brigade into this State for the purpose of obtaining beef-cattle for the Confederate Army: On Sunday, the 22nd ultimo, I commenced crossing my command at this ferry, and early on Monday morning had the whole force, numbering about 1,550 cavalry and [G. A.] Huwald's battery of three pieces, on the north bank of the river. . . .

. . . . On the morning of the 29th, I received a dispatch from Colonel Ashby, who had been sent by way of Crab Orchard, that the enemy was pressing him in heavy force. I immediately hurried the command on to Somerset, within 2 miles of which, on the morning of the 30th, I selected a strong position to resist the enemy. . . .

. . . . All officers who came under my notice behaved with great gallantry, most conspicuous of whom were Colonels [J. J.] Morrison and [H. M.] Ashby, Lieutenant-Colonel [A. R.] Harper, and Captain [W. M.] Footman. The last-mentioned brave man was commanding a detachment of the First Florida Cavalry, which came up just in time to make the most gallant efforts to resist the advance of the enemy, and which lost very heavily. Captain Footman had his horse killed under him. He has, during this expedition, rendered the most efficient service, being constantly in front when we were advancing, and in rear on the retreat. . . .

. . . . I am, sir, very respectfully, your obedient servant.,

JNO. PEGRAM,
Brigadier-General, Provisional Army Confederate States.

Captain J. G. MARTIN,
Asst. Adjt. General, Dept. of East Tennessee, Knoxville.
OR V23 Pt. 1, pp. 170-175 Pegram’s Expedition into Kentucky