Go on a campaign; go off to war.

synonym: campaign.

Roget 722: arm; raise troops, mobilize troops; raise up in arms; take up the cudgels etc. 720; take up arms, fly to arms, appeal to arms, fly to the sword; draw the sword, unsheathe the sword; dig up the hatchet, dig up the tomahawk; go to war, wage war, let slip the dogs of war" [Julius Caesar]; cry havoc; kindle the torch of war, light the torch of war; raise one's banner, raise the fire cross; hoist the black flag; throw away, fling away the scabbard; enroll, enlist; take the field; take the law into one's own hands; do battle, give battle, join battle, engage in battle, go to battle; flesh one's sword; set to, fall to, engage, measure swords with, draw the trigger, cross swords; come to blows, come to close quarters; fight; combat; contend etc. 720; battle with, break a lance with.    [pirates engage in battle] raise the jolly roger, run up the jolly roger.    serve; see service, be on service, be on active service; campaign; wield the sword, shoulder a musket, smell powder, be under fire; spill blood, imbrue the hands in blood; on the warpath.    carry on war, carry on hostilities; keep the field; fight the good fight; fight it out, fight like devils, fight one's way, fight hand to hand; sell one's life dearly; pay the ferryman's fee.    ... show more

Go on the playing field, of a football team.