I found another resource for gathering information on soldiers yesterday. It’s been around a while, but it’s new to me.
Allegheny County, Pennsylvania, in the War for the Suppression of the Rebellion, 1861-1865, by Samuel M. Evans, lists all of the army and navy volunteers from Allegheny County who fought in the Civil War. Entries include name, rank, company, regiment, type of service, and which tablet number the individual is listed on in Soldiers and Sailors Memorial Hall in Pittsburgh.
It is available here through the University of Pittsburgh Digital Research Library. It is based on a printed work of the same title published in Pittsburgh in 1924.
There’s some great information here. Much to my delight, I’ve found lists of three companies from the 6th US Cavalry, as well as discovering that scores of the members of the 1st MD Cav, 1st and 5th WV Cav, and 70th NY Inf were in fact Pennsylvanians.