20 Saul and all the people who were with him were gathered together, and came to the battle: and behold, every man's sword was against his fellow, (and there was) a very great confusion.
*Minor differences ignored. Grouped by changes, with first version listed as example.
Assembled themselves - See marg. Many versions give the sense "shouted," which is far preferable, and only requires a different punctuation.
And Saul, and all the people that were with him, assembled themselves,.... The six hundred men that were with him, unless we can suppose the 1000 that had been with Jonathan in Gibeah were here still, see 1-Samuel 13:2.
and they came to the battle; to the field of battle, the place where the army of the Philistines had lain encamped:
and, behold, every man's sword was against his fellow; taking one another for Hebrews, or treacherous and disaffected persons; so that, though the Israelites had neither swords nor spears, they needed none, for the Philistines destroyed one another with their own swords; and there was a
very great discomfiture; noise, tumult, confusion, slaughter, and destruction.
Saul and all the people--All the warriors in the garrison at Gibeah, the Israelite deserters in the camp of the Philistines, and the fugitives among the mountains of Ephraim, now all rushed to the pursuit, which was hot and sanguinary.
"And (i.e., in consequence of the increasing tumult in the enemy's camp) Saul had himself, and all the people with him, called," i.e., called together for battle; and when they came to the war, i.e., to the place of conflict, "behold, there was the sword of the one against the other, a very great confusion," in consequence partly of terror, and partly of the circumstance alluded to in 1-Samuel 14:21.
*More commentary available at chapter level.