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.
1 Samuel 4:10
Surrounding context
4:9 Be strong and conduct yourselves like men, you Philistines, that you do not become servants of the Hebrews, as they have been to you. Conduct yourselves like men, and fight!"
4:10 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.
4:11 Also the ark of God was captured; and the two sons of Eli, Hophni and Phinehas, died.