conflict, struggle, battle - an open clash between two opposing groups (or individuals); "the harder the conflict the more glorious the triumph"--Thomas Paine; "police tried to control the battle between the pro- and anti-abortion mobs"

blood feud, vendetta - a feud in which members of the opposing parties murder each other

fight, struggle - be engaged in a fight; carry on a fight; "the tribesmen fought each other"; "Siblings are always fighting"