Why were the philistines terrified when the Ark of the Covenant came into the camp?

ANSWER

they said "mighty gods have entered the camp"

1st Samuel 1 :

6 Hearing the uproar, the Philistines asked, “What’s all this shouting in the Hebrew camp?” When they learned that the ark of the LORD had come into the camp, 7 the Philistines were afraid. “A god has come into the camp,” they said. “Oh no! Nothing like this has happened before. 8 We’re doomed! Who will deliver us from the hand of these mighty gods? They are the gods who struck the Egyptians with all kinds of plagues in the wilderness. 9 Be strong, Philistines! Be men, or you will be subject to the Hebrews, as they have been to you. Be men, and fight!”
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