Golyos (Goliath) did.
The Philistines collected for war against Israel at Socoh and then encamped in Ephes-dammim. As the battle lines of the Philistines and Saul's army faced each other across the valley, the gigantic warrior Goliath emerged from the Philistine camp and loudly challenged Israel to supply a man to fight him in single combat, the outcome to determine which army should become the servant of the other. (1Samuel 17:1-11, 16)
If you are referring to David in the Holy Bible, then the answer is because He was blessed by God. He also killed Goliath (who was a Philistine giant & enemy of Israel).
The Philistine army.
The question is wrong. Americans fight for America.
The Philistines collected for war against Israel at Socoh and then encamped in Ephes-dammim. As the battle lines of the Philistines and Saul's army faced each other across the valley, the gigantic warrior Goliath emerged from the Philistine camp and loudly challenged Israel to supply a man to fight him in single combat, the outcome to determine which army should become the servant of the other. Morning and evening, for 40 days, the army of Israel, in great fear, was subjected to these taunts. No Israelite soldier had the courage to accept the challenge. (1Sam. 17:1-11, 16) The young shepherd David, with God's spirit upon him, met Goliath's challenge.
The Philistine army.
Israel was part of the Persian Empire but was not required to field troops with the Persian forces as they did not meet the standards of the army or navy.
Yes, Israel has a very powerful army.
Probably Goliath, champion of the Philistine Army, whose height is recorded at 9'9".
To prevent Saul's army from needing to engage with the Philistines, David accepted the "contest of champions" against the Philistine champion, Goliath.
Israel is the 3rd best army in the world and the most brutal.
No. There was no Jewish state or country and there was no Jewish government. (Israel didn't exist at that time as an independent state).