Roster of Confederate Soldiers, 1861-1865, shows:

Collins, James H. VA Lt.Arty. French's Co.
Collins, Lewis M. VA Lt.Arty. French's Co.
Collins, Michael H. VA Lt.Arty. French's Co.

Well, that's a start - 3 in one unit - who are the other 2?

VIRGINIA GILES LIGHT ARTILLERY BATTERY
aka MCCOMAS ARTILLERY - PEARLSBURG RESERVES
organized by the detatchment of Co 'B', Wise Legion, in early 1862 - armed with four 12-lb Napoleons on 12/28/64
surrendered at Appomattox Court House 04/09/65
FIRST COMMANDER: David Alexander French, Captain
CAPTAIN: Alexander Martin
ASSIGNMENTS:
Arty Bn, Floyd's Div, Central Army of KY, Dept #2 - Jan-Feb 1862
Arty Bn, Floyd's Div, Fort Donelson, Dept #2, Feb 1862
Stark's Arty Bn, Wise's Brigade, Elzey's Command, Dept of NC & So. VA, Dec 1862-Arp 1863
Stark's Arty Bn, Wise's Brigade, Dept of Richmond, Apr-Sept 1863
Stark's Arty Bn, Hunton's Command, Dept of Richmond, Sept-Oct 1863
Stark's Light Arty Bn, Chaffin's Farm, Dept of Richmond, Dec 1863-May 1864
Stark's Light Arty Bn, Chaffin's Farm, Arty Defenses, Dept of Richmond, May-Oct 1864
Stark's Bn, Artillery, 1st Corps, ANV, Oct 1864-Feb 1865
Stark's Bn, Artillery, 2nd Corps, ANV, March-April 1865
BATTLES:
Fort Dopnelson 02/12-16/62
Blake's Farm, near Deep Bottom, James River 08/06/63
Petersburg Siege June 1864-April 1865
Chaffin's Farm 09/29/64
Fort Gilmer 09/29-30/64
Appomattox Court House 04/09/65

Sifakis - Compendium of the Confederate Armies - VA - pages 36-37