"In the nineteenth century the Khyber became the fulcrum of the Great Game, the contest between the United Kingdom and Russia for control of Central Asia and India. The first Afghan War (1839-42) began when British commanders sent a huge army of British and Indian troops into Afghanistan to secure it against Russian incursions, replacing the ruling emir with a British protege. Facing Afghan opposition, by January 1842 the British were forced to withdraw from Kabul with a column of 16,500 soldiers and civilians, heading east to the garrison at Jalalabad, 110 miles away. Only a single survivor of that group ever made it to Jalalabad safely, though the British forces did recover some prisoners many months later.

According to the late Louis Dupree, the premier historian of Afghanistan, four factors contributed to the British disaster: the occupation of Afghan territory by foreign troops, the placing of an unpopular emir on the throne, the harsh acts of the British-supported Afghans against their local enemies, and the reduction of the subsidies paid to the tribal chiefs by British political agents. The British would repeat these mistakes in the second Afghan War (1878-81), as would the Soviets a century later; the United States would be wise to consider them today."
Do ya think maybe we studied this just a bit?
You clearly haven't.
Ed