Albert Barnes Commentary 1 Samuel 4:8

"Woe unto us! who shall deliver us out of the hand of these mighty gods? these are the gods that smote the Egyptians with all manner of plagues in the wilderness." — 1 Samuel 4:8 (ASV)

This is a remarkable testimony from the Philistines to the truth of the events recorded in the Pentateuch. They would naturally have heard of them, just as Balak and the people of Jericho did (Numbers 22:5; Joshua 2:10).

The phrase With all the plagues should be understood as “with every kind of plague,” which is equivalent to “with utter destruction.”