Warning: Graphic images

Soon after the attacks of September 11, 2001, the US military's attention turned to Afghanistan, where al-Qaida's leaders were based. Many knew an invasion was sure to come.

What no one knew

2001-2002: The war begins

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2003-2007: Drift to Iraq

2008-2010: Recommitment and surge

2011-2013: A troop drawdown

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2014-2018: A Taliban resurgence

2018-2020: Peace talks and a historic deal