Megiddo's Shadow — Arthur Slade

Fueled by anger at the death of his two brothers in World War I, 16-year-old Edward abandons his ailing father on their farm and leaves Canada to enlist. After proving that he can tame any wild horse, he's is sent to Jordan to fight with the Cavalry.

Luckily, his horse is the extraordinary Buke; in battle, a trooper's horse is the key to life and death, and his true companion. In the harsh desert, Edward is grateful for the camaraderie of his tent mates, Cheevers and Blackburn,and letters from Emily, a nurse he met at base camp. As they close in on the enemy Edward finds that the glory and noble vengeance he seeks is replaced by the horror of war and the realization that he must fight not only to survive, but also, to kill.