1 Samuel 4:2-3, 10-11

The Philistines assembled in battle formation to meet Israel, and when the battle was over, Israel was defeated by the Philistines, who killed about four thousand men on the battlefield. When the people (soldiers) came 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 here from Shiloh, so that He may come among us and save us from the hand of our enemies.”

So the Philistines fought; Israel was defeated and every man fled to his tent. It was a very great defeat, for thirty thousand foot soldiers of Israel fell. Also the ark of God was taken; and the two sons of Eli, Hophni and Phinehas, were killed. [1 Sam 2:34]