All through the reign of Saul, there was constant war with the Philistines, who lived upon the lowlands west of Israel. At one time, when David was still with his sheep, a few years after he had been anointed by Samuel, the camps of the Philistines and the Israelites were set against each other on opposite sides of the valley of Elah. In the army of Israel were the three oldest brothers of David.
 
Every day a giant came out of the camp of the Philistines, and dared some one to come from the Israelites' camp and fight with him. The giant's name was Goliath. He was nine feet high; and he wore armor from head to foot, and carried a spear twice as long and as heavy as any other man could hold; and his shield bearer walked before him. He came every day and called out across the little valley:
 
"I am a Philistine, and you are servants of Saul. Now choose one of your men, and let him come out and fight with me. If I kill him; then you shall submit to us; and if he kills me, then we will give up to you. Come, now, send out your man!"
 
But no man in the army, not even King Saul, dared to go out and fight with the giant. Forty days the camps stood against each other, and the Philistine giant continued his call.
 
One day, old Jesse, the father of David, sent David from Bethlehem to visit his three brothers in the army. David came, and spoke to his brothers; and while he was talking with them, Goliath the giant came out as before in front of the camp calling for some one to fight with him.
 
They said one to another:
 
"If any man will go out and kill this Philistine, the king will give him a great reward and a high rank; and the king's daughter shall be his wife."
 
And David said:
 
"Who is this man that speaks in this proud manner against the armies of the living God? Why does not some one go out and kill him?"
 
David's brother Eliab said to him:
 
"What are you doing here, leaving your sheep in the field? I know that you have come down just to see the battle."
 
But David did not care for his brother's words. He thought he saw a way to kill this boasting giant; and he said:
 
"If no one else will go, I will go out and fight with this enemy of the Lord's people."
 
They brought David before King Saul. Some years had passed since Saul had met David, and he had grown from a boy to a man, so that Saul did not know him as the shepherd who had played on the harp before him in other days.
 
Saul said to David:
 
"You cannot fight with this great giant. You are very young; and he is a man of war, trained from his youth."
 
And David answered King Saul:
 
"I am only a shepherd, but I have fought with lions and bears, when they have tried to steal my sheep. And I am not afraid to fight with this Philistine."
 
Then Saul put his own armor on David—a helmet on his head, and a coat of mail on his body, and a sword at his waist. But Saul was almost a giant, and his armor was far too large for David. David said:
 
"I am not used to fighting with such weapons as these. Let me fight in my own way."
 
So David took off Saul's armor. While everybody in the army had been looking on the giant with fear, David had been thinking out the best way for fighting him; and God had given to David a plan. It was to throw the giant off his guard, by appearing weak and helpless; and while so far away that the giant could not reach him with sword or spear, to strike him down with a weapon which the giant would not expect and would not be prepared for.
 
David took his shepherd's staff in his hand, as though that were to be his weapon. But out of sight, in a bag under his mantle, he had five smooth stones carefully chosen, and a sling,—the weapon that he knew how to use. Then he came out to meet the Philistine.
 
The giant looked down on the youth and despised him, and laughed.
 

 
"Am I a dog?" he said, "that this boy comes to me with a staff? I will give his body to the birds of the air, and the beasts of the field."
 
And the Philistine cursed David by the gods of his people. And David answered him:
 
"You come against me with a sword, and a spear, and a dart; but I come to you in the name of the Lord of hosts, the God of the armies of Israel. This day will the Lord give you into my hand. I will strike you down, and take off your head, and the host of the Philistines shall be dead bodies, to be eaten by the birds and the beasts; so that all may know that there is a God in Israel, and that He can save in other ways besides with sword and spear."
 

 
And David ran toward the Philistine, as if to fight him with his shepherd's staff. But when he was just near enough for a good aim, he took out his sling, and hurled a stone aimed at the giant's forehead. David's aim was good; the stone struck the Philistine in his forehead. It stunned him, and he fell to the ground.
 
While the two armies stood wondering, and scarcely knowing what had caused the giant to fall so suddenly, David ran forward, drew out the giant's own sword, and cut off his head. Then the Philistines knew that their great warrior in whom they trusted was dead. They turned to flee to their own land; and the Israelites followed after them, and killed them by the hundred and the thousand, even to the gates of their own city of Gath.
 
So in that day David won a great victory and stood before all the land as the one who had saved his people from their enemies.