The Battle of the Trench () also known as the Battle of the Confederates (), was a fortnight-long siege of Yathrib (now Medina) by Arab and Jewish tribes. The strength of the confederate armies is estimated around 10,000 men with six hundred horses and some camels, while the Medinan defenders numbered 3,000. The battle began on March 31, 627. The defeat caused the Meccans to lose their trade and much of their prestige.