I usually equate the term "galvanized" with P.O.W's that switched sides. I had a few east Tennessee Confederate relatives that switched sides after Vicksburg and fought their former comrades. Those that "galvanized" in prison were usually sent out west to fight Indians.

Here's a site dealing with "galvanized Rebels". not a subject one hears about often.

http://breckinridgegreys.org/galvanized1.html