found in civil war area..no idea what this is..or was

[dickenz07]

It was heavily coated with green crusty corrosion
It also looks as though something was broken off the ear on The back side

 

[Rprimm]

I've found atleast two of these in a place with Civil War history too, I think it's some type of tack, one of the ones I found still had the long piece on the back in tact and it was very pointy.