We Are the Mighty explains the missions of the US Special Forces who quickly worked with the Northern Alliance in Afghanistan to attack the Taliban.
Before 9/11, the last time American forces fought on horseback was on January 16, 1942 when the U.S. Army’s 26th Cavalry Regiment charged an advanced guard of the 14th Japanese Army as it advanced from Manila.
After the terror attacks of Sep. 11, 2001, the United States demanded the extradition of Osama bin Laden from the Taliban, then the recognized government of Afghanistan. When the Taliban didn’t cough him up, the U.S. military went to work.
Official combat operations started on Oct. 7, 2001 in the form of airstrikes and Tomahawk missile strikes against suspected al-Qaeda training sites near Kandahar, Kabul, and Herat. On Nov. 16, Defense Secretary Donald Rumsfeld announced “we have had limited number of American forces on the ground for weeks.” He was talking about the Horse Soldiers, U.S. Special Forces attempting to secure Northern Afghanistan with the Afghan Northern Alliance.
http://www.scout.com/military/warrior/story/1671044-us-special-forces-who-avenged-9-11-horseback