The LORD shall go forth as a mighty man, he shall stir up jealousy like a man of war: he shall cry, yea, roar; he shall prevail against his enemies.
The Lord shall go forth as a mighty man. Yahweh will no longer restrain His wrath He will go forth as a mighty warrior (Exodus 15:3) to destroy His people's and His enemies, and to deliver Israel (cf. Psalms 45:3).
He shall stir up jealousy - rouse His indignation
He shall cry, yea, roar - image from the battle-cry of a warrior.