The United States invasion of Afghanistan occurred after the September 11 attacks in late 2001 and was supported by close US allies which had officially began the War on Terror. The conflict is also known as the US war in Afghanistan or the 2001 invasion of Afghanistan. Its public aims were to dismantle al-Qaeda and deny it a safe base of operations in Afghanistan by removing the Taliban from power. The United Kingdom was a key ally of the United States, offering support for military action from the start of preparations for the invasion. It followed the Afghan Civil War's 1996–2001 phase between the Taliban and the Northern Alliance groups, although the Taliban controlled 90% of the country by 2001. The US invasion of Afghanistan became the first phase of the War in Afghanistan (2001–pres