The Brits used it (khaki uniform) starting in 1848 in India.

Was that during a war? Cuz that's not the answer I have in my book.

What's the year in your book? There was almost always a border dispute or regional rebellion that the British were involved in in India.

If I say the year you will figure out the war, but I promise this is an actual war, not a dispute or rebellion. I can't say much about the war cuz i don't know much about it.

Boer War?

nope. Finally found a hard one. If no one can get it in the next couple days I'll post the answer and a new question.

Are you sure your book is right? I came up with the Boer War too, according to this
http://freepages.military.rootsweb.c...dson/khaki.htm

Surprisingly it was not until 1885 that the entire army in India followed suit. It then took fifteen years before the British military adopted the uniform - referred to as KD, Khaki Drill - to fight the Boer War. Khaki has since, of course, been used by armies throughout the world.

EDIT: Or is it the Kaffir War in South Africa during 1851?

This was before the Boer war and it wasn't the Kaffir war.

The American Revolution. All that desert fighting sure warented some drastic style changes :P

Then Paul Revere would have yelled "The mudcoats are coming, the mudcoats are coming!"

Ok after much digging I haven't gotten a definate answer, but the closest I came is the Crimea War.