When the Philistines come to attack King Saul's army, they send a representative from their side to offer the Israelites a deal. Not everyone has to fight! If someone defeats Goliath, their giant soldier, then the Philistines will become their servants. If Goliath wins, then Israel will serve them.  David arrives on the scene with food for his brothers. Although he is not yet an adult, he offers to fight Goliath. Isn't there somebody else who can do it?