Talbot Mundy 
Jimgrim and the Lost Trooper [EPUB ebook] 

Adventures in Araby—what is now Palestine and Israel and Jordan and Saudi Arabia and Iraq—with Jimgrim—Major James Schuyler Grim—and assorted adventurers. You wouldn’t find a tougher, less easily stampeded gang in Asia Minor than the party Grim had left with me. They spat on their cartridges and crammed them in like veteran soldiers instead of the thieves they were by trade, and each bullet was loosed on its way with an appropriate curse, until Narayan Singh on the far right laughed so that he could hardly shoot straight. And the camels went down one by one like great ships sinking, pitching up their sterns as they plunged bow first.