What are the odds???

So on a well known civil war battle area that has been pounded and is an old farm now. Decided to search some rough areas that maybe others had passed over due to brush. Found three good targets. Two three ringers and a penny. The penny has been shot. What are the odds that it was shot during the battle???? Neat find but I can't even tell enough about the penny to know if it as wheatie or and IHP that could be from the period. Anyone see anything I don't or have any other ideas of the best next step to clean it. I have ruined toasted ones before so don't want to get too carried away and take it the point of no return until I have tried everything gentle first. Thanks for looking and HH.