1 Samuel 4:9

"'Be strong, Philistines! Be men, or you will be subject to the Hebrews, as they have been to you. Be men, and fight!'" NIV translation

The leaders of the Philistines urged their men to fight. They reminded them that, if they did not, then they would be slaves to the Israelites. They did not know that God was not in the Israelite camp but they were able to overcome their fear because they didn't really have any other option.

1 Samuel 4:10 & 11

"So the Philistines fought, and the Israelites were defeated and every man fled to his tent. The slaughter was very great; Israel lost thirty thousand foot soldiers. The ark of God was captured, and Eli's two sons, Hophni and Phinehas, died." NIV translation

The Israelites were routed and the ark was captured by the Philistines. God's word concerning Eli's sons was brought to pass as they were both killed on the same day.

This is a reminder to us that the best laid plans of man are nothing when they come up against God's plan. It also reminds us that we cannot assume that God will be with us when we are not following Him because He will not. God leads; He does not follow.