Joshua 4:19 - Albert Barnes' Notes on the Bible

Gilgal, mentioned here by anticipation (compare Joshua 5:9), the modern Jiljulieh (Conder), was on rising ground (compare Joshua 5:3), and, according to Josephus, nearly five miles from the river, and consequently about two from the city itself. The site of the camp was no doubt fortified by Joshua, as it constituted for some time the abiding foothold in Canaan, from where he sallied forth to subdue the country. It was also the place of safety where the ark, and no doubt also the women, children, cattle, and other property of the people were left. Hence, the demolition of Jericho and Ai, strong fortresses in the neighborhood of Gilgal, was no doubt dictated by sound policy as well as by religious obligations.