Isaiah 42:13

The reason for the universal exultation; Jehovah takes the field against His enemies. The gracious side of His intervention is reserved for Isaiah 42:16.

The Lord shall go forth The technical expression for the initiation of a campaign (2 Samuel 11:1; Amos 5:3 &c.)

as a mightyman (or, hero) … a man of war Similar representations in ch. Isaiah 28:21; Isaiah 59:16 f.; Exodus 15:3; Zechariah 14:3, &c. Jealousy(better, zeal) means "passion" in very varied senses. Here it seems equivalent to the "battle fever." see ch. Isaiah 9:7.

he shall cry, yea, roar He shall raise His battle cry, yea, shout aloud.

he shall prevail R.V. "he shall do mightily"; lit., he shall play the hero. The form occurs elsewhere only in Job (Job 15:25; Job 36:9).