The 2001 fall of Kabul took place during the War in Afghanistan. Northern Alliance forces began their attack on the city on 13 November that year and made swift progress against Taliban forces that were heavily weakened by American and British air strikes. The advance moved ahead of plans, and the next day the Northern Alliance forces (supported by ODA 555) entered Kabul and met no resistance inside the city. Taliban forces retreated to Kandahar in the south.