I Samuel 4:2-3, 10-11

Then the Philistines put themselves in battle array against Israel. And when they joined battle, Israel was defeated by the Philistines, who killed about four thousand men of the army in the field. And when the people had come into the camp, the elders of Israel said, “Why has the LORD defeated us today before the Philistines? Let us bring the ark of the covenant of the LORD from Shiloh to us, that when it comes among us it may save us from the hand of our enemies.”

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.