1 Samuel 13:23 - Joseph Benson’s Commentary on the Old and New Testaments

And the garrison of the Philistines went out This probably refers to the garrison mentioned in the beginning of the next chapter. And Michmash seems to have been the name of the garrison, not of the passage: as if it had been said, The garrison of the Philistines in Michmash went out to the passage. For Michmash, it appears, was upon a high hill, as Gibeah was, between which places was a valley, called here a passage, into which the garrison descended to invite the Israelites to battle.