When the Philistines heard the noise of the shout, they said, What means the noise of this great shout in the camp of the Hebrews? They understood that the ark of Yahweh was come into the camp.
Eli must have realized that the death of his two sons in battle fulfilled God’s previously announced judgment, but he seems to have been more shocked at the capture of the ark. He died that day (12-18). So too did Eli’s daughter-in-law, who was also shocked at the capture of the ark. God had surely departed from Israel (19-22).