1 Samuel 5:2

They brought it into the house of Dagon. — The conquerors, we are told, in the meantime, with triumph, carried the captured Ark from the battle-field to Ashdod. This was one of the capital cities of the five Philistine princes. It is built on a hill close to the Mediterranean Sea, and was in after days known as Azotus (Atos 8:40).

In Ashdod they placed it in the temple of the popular Philistine god, Dagon. This was their vengeance for the slaughter of the 3,000 Philistine worshippers in the temple of the same deity at Gaza, not many years before, by the blind Hebrew champion Samson.

The princes and Philistine people well remembered how the blind hero on that awful day, when 3,000 perished in the house of Dagon when he with his superhuman strength forced the great temple pillars down, called on the name of the God of Israel, whom they in their idol-trained hearts associated with the golden Ark.
“This only hope relieves me, that the strife
With me hath end, all the contest now
‘Twixt God and Dagon; Dagon hath presumed,
Me overthrown, to enter lists with God,
His deity comparing and preferring
Before the God of Abraham. He, be sure,
Will not connive or linger thus provoked,
But will arise, and His great name assert.” — MILTON.

The insulted Dagon and all their murdered countrymen should be avenged by the perpetual humiliation of the “God of Abraham.”

The sacred Ark should henceforth be placed at the feet of their god Dagon.