This is the only E. W. Furguson/Ferguson found in Virginia units

E. W. Furguson

Residence was not listed;
Enlisted as a Private
"C" Co. VA 13th Cavalry

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records

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E. W. Furguson, Private, Company C, 13th Regiment Virginia Cavalry, enlisted November 18, 1864 at Stony Creek by
E. L. Ballard for the war, recorded at the end of year as absent, sick, no further records

Note, there are no subsequent muster rolls for year 1865 which precludes information on his later service

M324: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Virginia

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This regiment had 298 men in action in Gettysburg and surrendered on April 9, 1865, with 10 officers and 78 men.
http://en.wikipedia.org/wiki/13th_Virginia_Cavalry