Kabul, capital of Afghanistan, fell in November 2001 to the Northern Alliance forces during the war in Afghanistan. Northern Alliance forces began their attack on the city on 13 November and made swift progress against Taliban and al-Qaeda 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 entered Kabul and met no resistance inside the city. Taliban forces retreated to Kandahar in the south.