Albert Barnes Commentary Judges 1:18

"Also Judah took Gaza with the border thereof, and Ashkelon with the border thereof, and Ekron with the border thereof." — Judges 1:18 (ASV)

It is remarkable that Ashdod is not mentioned here, as it is in Joshua 15:46-47, in conjunction with Gaza and Ekron; but that Askelon, which is not in the list of the cities of Judah at all, is named instead. (See Joshua 13:3 note.) It is a curious fact that when Rameses III took Askelon it was occupied, not by Philistines, but apparently by Hebrews. Rameses began to reign in 1269 B.C. and reigned 25 years. At any time between 1269 and 1244 B.C. such occupation of Askelon by Hebrews agrees with the Book of Judges.