After fighting all the first day, the two sides retired to their camps. "On the morrow" (Ether 15:17), they went to battle again. Thus "on the morrow" they fought a second day (vv. 17-19), and a third day (v. 20), and a fourth day (v. 21-22), and a fifth day (vv. 23-25), and a sixth day (vv. 26-28) on which Coriantumr's men "were about to flee for their lives," but apparently on the seventh day or "on the morrow" Shiz's men caught up with Coriantumr's men where Coriantumr finally "smote off the head of Shiz."
The last use of the phrase "on the morrow" (Ether 15:29) implies that Coriantumr's men fled at least part of one day from the scene of the final battles (the hill Ramah/Cumorah) before Shiz's group caught them. Wounded, Coriantumr could probably have only gone a few miles at most. [Alan C. Miner, Personal Notes]