War songs tend to fall into three basic categories. a) Popular songs aimed at the general (non-fighting) population; b)Soliers' songs in praise of the soldier's own outfit (like college fight songs) and 3)Songs of general bitching about the war and the army/navy or whatever.
Battleship of Maine (and "Crazy War" and all it's descendents are clearly in the third, nd IMO the most interesting) category.