Deborah's most famous achievement was leading Israel to victory against Jabin, the Canaanite king of Hazor, and his military commander Sisera, who had oppressed the Israelites for twenty years with an army featuring nine hundred iron chariots. When the Israelites cried out to God for help, Deborah summoned Barak, a military leader from the tribe of Naphtali, and relayed God's command that he should take ten thousand men to Mount Tabor to fight Sisera's forces. Barak agreed to go only if Deborah accompanied him into battle, demonstrating the extraordinary respect and trust she commanded. Deborah agreed but prophesied that because of Barak's reluctance, the glory of victory would go to a woman. The battle took place at the Kishon River, where a sudden rainstorm caused the river to flood, rendering Sisera's iron chariots useless in the mud and giving the Israelite foot soldiers a decisive advantage. Sisera fled on foot and sought refuge in the tent of Jael, a Kenite woman who was allied with Israel. While Sisera slept, Jael drove a tent peg through his temple, killing him and fulfilling Deborah's prophecy. After the victory, Deborah and Barak sang a victory song, known as the "Song of Deborah" (Judges 5), which is considered one of the oldest passages in the Hebrew Bible and a masterpiece of ancient Hebrew poetry. The song celebrates the triumph, praises those tribes who fought, criticizes those who didn't participate, and gives glory to God and to the women—Deborah and Jael—who secured Israel's freedom.