Many "Galvanized Yankees" [meaning those Confederate prisoners of war who joined the Union army while in Union prison camps] served in units other than the six United States Volunteer regiments recruited in 1864. The following units were recruited from the prison pen at Fort Delaware:

A significant [but as yet undocumented] number of Confederate POWs refused to be paroled for exchange at Fort Delaware at the end of August 1862 under the terms of the Dix-Hill Cartel. They were allowed to take the Oath of Allegiance and were released into Northern society. It was claimed in a post-war history that many of them found "jobs" in Company C, 4th Delaware Infantry. This infantry unit fought in the Federal Army of the Potomac.

Ahl's Battery, 1st Delaware Heavy Artillery was recruited at Fort Delaware in July 1863 and remained stationed at Fort Delaware as guards over the other Confederate POWs until the end of the war.

Battery M, 3rd Pennsylvania Heavy Artillery was allowed to complete its organization by recruiting a substantial number of Confederate prisoners from the pen at Fort Delaware. The 3rd Pennsylvania Heavy Artillery was sent to Fort Monroe. Over-recruited (I believe a little bait and switch was at work here), many of the ex-Confederates stepped forward when volunteers were called for to form the 187th Pennsylvania Infantry in the spring of 1864. They participated in the assault and capture of Fort Harrison on the north bank of the James River just east of Richmond.

The 3rd Maryland Cavalry recruited four companies of men from the prison pen at Fort Delaware in September 1863. Initially posted around Baltimore, the 3rd Maryland Cavalry was sent to Louisiana and participated in the 1864 Red River Campaign.

The 1st Connecticut Cavalry recruited its Company G, from the prison pen at Fort Delaware. Posted initially around Baltimore, a handful of ex-Confederates scattered in other companies of this regiment were consolidated into Company G just prior to the beginning of Grant's 1864 "On to Richmond" Campaign. Company G was then detached and sent to Minnesota to fight the Native Americans. Its designation was changed in April 1865 to 1st Independent Company, United States Volunteers, but it was never assigned to the 1st Regiment, U. S. Volunteers recruited from the prison pen at Point Lookout.

I have post-war unit history rosters for these eight Federal companies and have been working to cross match enrolled names against Confederate service records. Several of my 12th Louisiana boys opted to join Battery M, 3rd Pennsylvania Volunteers and participated in the assault on Fort Harrison. Mississippi was well represented in Company G, 1st Connecticut Cavalry and probably in the other units as well. I am still researching these units. If you have the names and Compiled Military Service Records of Confederate POWs who "took the Oath" prior to April 9, 1865 while at Fort Delaware, please get in touch with me. I will be happy to exchange information with you and share what I have learned from the Federal unit histories.

Hugh Simmons
Fort Delaware Society
http://www.del.net/org/fort