Army: n A large body of people organized and trained for land warfare. War: n A state of open, armed, often prolonged conflict carried on between nations, states, or parties. One person doesn't make an army and can't wage a war. Granted though - individuals can join a war for whatever reason they choose - but usually only one reason is sanctioned by the State. Most people don't fight in wars for strictly personal reasons. Monte. ok so technically you cant have an army of one, but you could technically wage a war by yourself. that "party" could be a party which contains only yourself but still be considered a party...or something? maybe.