The term "galvanized" has also been applied to former Union soldiers enlisting in the Confederate Army, including the use of "galvanized Yankees" to designate them. At least 1,600 former Union prisoners of war enlisted in Confederate service in late 1864 and early 1865, most of them recent German or Irish immigrants who had been drafted into Union regiments. The practice of recruiting from prisoners of war began in 1862 at Camp Douglas at Chicago, Illinois, with attempts to enlist Confederate prisoners who expressed reluctance to exchange following their capture at Fort Donelson. Some 228 prisoners of mostly Irish extraction were enlisted by Col. James A. Mulligan before the War Department banned further recruitment March 15. The ban continued until 1863, except for a few enlistments of foreign-born Confederates into largely ethnic regiments.