"Simple at not time in history do you fiend any large war with 3 sides."
Cold war, post-China/Russia split. There were four main actors, not counting puppet states; NATO vs Warsaw Pact vs China vs India. India and China and the USSR fought border battles which killed thousands, and during a period in the late 1960s it was feasible that the world might plunge into a four-way global armageddon (with, presumably, most of India and China surviving to repopulate the globe). I can't think of a larger war.
(puts on hippy hat) And if you think about it, all wars in history have only ever had one side, and that side is us.