verb

take part in a violent struggle involving the exchange of physical blows or the use of weapons.

the men were fighting

brawl,come to blows,exchange blows,attack/assault each other,hit/punch each other,box,struggle,grapple,wrestle,scrimmage,do battle,engage in conflict,contend,spar,joust,tilt,cross swords,lock horns,lock antlers,scrap,have a dust-up,have a set-to,have a punch-up,swedge,roughhouse,stoush,go the knuckle,violent,combative,aggressive,pugnacious,truculent,belligerent,bellicose,disputatious,antagonistic,argumentative,hawkish