THE STORY OF THE MALAKAND FIELD FORCE – AN EPISODE OF FRONTIER WAR by Winston Churchill, c/w illustrations, is available here for free download in PDF format.
The Story of the Malakand Field Force: An Episode of Frontier War was an 1898 book written by Winston Churchill; it was his first published work of non-fiction.
It details an 1897 military campaign on the Northwest Frontier (an area now part of Pakistan). Churchill participated in the campaign as a second lieutenant in the cavalry; he volunteered for the posting, having become bored of playing polo in India.
See a brief history of the Malakand campaign here on the Revhead blog site.