I Samuel 4:6-7, 10-11

Now when the Philistines heard the noise of the shout, they said, “What does the sound of this great shout in the camp of the Hebrews mean?” Then they understood that the ark of the LORD had come into the camp. So the Philistines were afraid, for they said, “God has come into the camp!” And they said, “Woe to us! For such a thing has never happened before.

So the Philistines fought, and Israel was defeated, and every man fled to his tent. There was a very great slaughter, and there fell of Israel thirty thousand foot soldiers. Also the ark of God was captured; and the two sons of Eli, Hophni and Phinehas, died.