I'm wondering, mightn't there be a mix up with this general? According to the US Civil War Generals website Charles Sidney Winder was promoted to brigadier general in march 1862, the one in game appears with the first promotion of brigadier generals in 1861. On the other hand the US Civil War Generals website gives a John Henry Winder made brigadier general in June 1861.
Here is the link to the W page of that site.
http://sunsite.utk.edu/civil-war/cong_w.html