What does 2 Samuel 23:11 mean?

After him came Shammah, son of Agee, from Harar. The Philistines gathered at a field full of lentils, and the Israelite troops ran away from them. 2 Samuel 23:11 - Modern Text Bible

(Shammah is introduced as another of David's top warriors. The scene is set: the Philistines attack, and everyone else flees.)