PS
F3WMB - a really good pal of mine is a living relative of William Brydon - pictured below. He was the sole survivor to ride into J-Bad from the retreat from Kabul (save for some hostages that were later returned). He was the Asst Surgeon for the 12,000 personnel that were eventually massacred on their way and a part of your picture. His life is believed to have been saved by a magazine that was tightly rolled in his hat that saved him from what would have been a fatal sabre cleave of his skull!
PPS - I guess this was called a defeat even though we came back in force a few more times after that, took the ground, held it for a number of years and still retained the capability to take it back after retreat. I just don't consider that a 'loss' or 'defeat'.