Destruction of Elphinstone's army.

Remnants of an Army by Elizabeth Butler depicting the arrival of assistant surgeon, William Brydon, at Jalalabad on 13 January 1842.

On 1 January 1842, following some unusual thinking by Elphinstone, which may have had something to do with the poor defensibility of the cantonment, an agreement was reached that provided for the safe exodus of the British garrison and its dependants from Afghanistan. Five days later, the withdrawal began. The departing British contingent numbered around 16,500, of which about 4,500 were military personnel, and over 12,000 were camp followers. The military force consisted mostly of Indian units and one British battalion, 44th Regiment of Foot.

They were attacked by Ghilzai warriors as they struggled through the snowbound passes. The evacuees were killed in huge numbers as they made their way down the 30 miles (48 km) of treacherous gorges and passes lying along the Kabul River between Kabul andGandamak, and were massacred at the Gandamak pass before a survivor reached the besieged garrison at Jalalabad. The force had been reduced to fewer than forty men by a withdrawal from Kabul that had become, towards the end, a running battle through two feet of snow. The ground was frozen, the men had no shelter and had little food for weeks. Of the weapons remaining to the survivors, there were approximately a dozen working muskets, the officers' pistols and a few swords. The remnants of the 44th were all killed except Captain James Souter, Sergeant Fair and seven soldiers who were taken prisoner. The only soldier to reach Jalalabad was Dr. William Brydon.