Excerpt: 'On the morning of September 11, 1879, I lay shivering with fever and ague at Alikhel in Afghanistan. So sick did I seem that it was decided I should be carried a day's march back to G.H.Q. on the Peiwar Kotal to see if the air of that high mountain pass would help me to pull myself round. Polly Forbes, a boy subaltern not very long from Eton, was sent off to play the part of nurse. We re...