OK, maybe I'm just blind but I can't find the save game files. I'd like to delete them as a group, not one at a time. There are a LOT of them and i don't find them in the "show folder" tab.

To quote the Official forums:

C:\Users\<user_name>\AppData\LocalLow\Game Labs\Ultimate General Civil War\Save

"In there will be three folders - CampaignBattle, HistoricalBattle, and OwnBattle (also known as Custom Battle). Inside each will the save files named with a seemingly random order of numbers and letters. You can tell which one is which by looking at the save times and cross-checking it with the save times in-game, or by opening up the save file with a hex editor and looking at the name of it near the top."

I think this is one of the minor flaws of the game, obscure save folder.