The Philistines understood that having defeated the Israelites in battle, their god Dagon
had defeated the God of Israel, the Lord (cf. Jeremiah 43:12). By taking the ark of the Lord into the temple of Dagon, the defeated god
is symbolically brought before the victorious god.
1 To their minds the Lord is now meant to worship Dagon.2
2 Then the Philistines took the ark of God and brought it into the house of Dagon and set it up beside Dagon.