God informed Gideon that the men he had gathered were too many – with so many men, there would be reason for the Israelites to claim the victory as their own instead of acknowledging that God had saved them. God first instructed Gideon to send home those men who were afraid. Gideon then allowed any man who wanted to leave, to leave; 22,000 men returned home and 10,000 remained. Yet the number was still too many, according to God:(4) But Adonai Elohim Said to Gideon, "There are still too many men. Take them down to the water, and I will sift them for you there. If I say, 'This one shall go with you, he shall go; but if I say, this one shall not go with you, he shall not go." (5) So Gideon took the men down to the water. There Adonai Elohim Told him, "Separate those who lap the water with their tongues like a dog from those who kneel down to drink." (6) Three hundred men lapped with their hands to their mouths. All the rest got down on their knees to drink. (7) Adonai Elohim Said to Gideon, "With the 300 men that lapped I will save you and give the Midianites into your hands. Let all the other men go, each to his own place.(Judges 7:4–7, NIV Bible)During the night God instructed Gideon to approach the Midianite camp. Gideon overheard a Midianite man tell a friend of a dream in which God had given the Midianites over to Gideon. Gideon worshiped God for His encouragement and revelation. Gideon returned to the Israelite camp and gave each of his men a trumpet (shofar) and a clay jar with a torch hidden inside. Divided into three companies, Gideon and the three hundred marched on the enemy camp.(17) "Watch me," he told them. "Follow my lead. When I get to the edge of the camp, do exactly as I do. (18) When I and all who are with me blow our trumpets, then from all around the camp blow yours and shout, 'For Adonai and for Gideon.' " .... (20) The three companies blew the trumpets and smashed the jars. Grasping the torches in their left hands and holding in their right hands the trumpets they were to blow, they shouted, "A sword for Adonai and Gideon!" (21) While each man held his position around the camp, all the Midianites ran, crying out as they fled. (22) When the three hundred trumpets sounded, Adonai caused the men throughout the camp to turn on each other with their swords. (Judges 7:17–22, NIV Bible)
300, of course, is exactly three percent of 10,000.