There is a J. W. McKnight aka James McKnight listed with Co I, 46th Va Inf and a James W. McKnight listed with Charles R. Coakley's Company 5th Va Cav.

46th Regt Va Inf organized 8/8/1861 and on 8/13/1861 Co I was transferred to 60th Regt Va Inf. Co I, Capt White G. Ryan's Co, organized 6/19/1861; enlisted for 1 year 8/10/1861; assigned to 60th Regt VA Inf 8/13/1861; reorganized 4/27/1862

5th Cavalry Regiment was organized in June, 1862, using the 2nd Battalion Virginia Cavalry as its nucleus. The men were from Petersburg and Fairfax, Gloucester, King and Queen, Mathews, Randolph, and James City counties. It was assigned to W.H.F. Lee's, F. Lee's, Lomax's, and Payne's Brigade, Army of Northern Virginia. The unit participated in the Seven Days' Battles, the Second Manassas and Maryland campaigns, and the conflicts at Fredericksburg, Brandy Station, Upperville, Gettysburg, Bristoe, and Mine Run. Later it was involved at The Wilderness and Cold Harbor, and in Early's Shenandoah Valley operations. On November 8, 1864, it was consolidated with the 15th Virginia Cavalry Regiment and redesignated the 5th Regiment Virginia Cavalry Consolidated. This command took part in the defense of Petersburg and saw action around Appomattox. Only 150 men were engaged at Gettysburg and 2 surrendered at Appomattox as most cut through the Federal lines and disbanded. The field officers were Colonels Reuben B. Boston, H. Clay Pate, and Thomas L. Rosser; Lieutenant Colonel James H. Allen; and Majors Beverly B. Douglas, John Eells, Cyrus Harding, Jr., and John W. Puller.