In 1846-1847, a ragtag army of 800 American volunteers marched 3,500 miles across deserts and mountains, through Indian territory and into Mexico. There they handed the Mexican army one of its most demoralizing defeats and helped the United States win its first foreign war. Their leader Colonel Alexander Doniphan, also a volunteer, was a "natural soldier" of towering stature who became a national hero in the wake of his wartime exploits. Doniphan was a small-town Missouri lawyer untrained in military matters when he answered President Polk's call for volunteers in the war with Mexico. Working from a host of primary sources, Joseph Dawson focuses on Doniphan's extraordinary leadership and chronicles how the colonel and his 1st Missouri Mounted Regiment helped capture New Mexico and went on to invade Chihuahua. Dawson's thorough account captures the expansionist mood of America in the mid-nineteenth century and helps us understand how American soldiers were motivated by the idea of Manifest Destiny. His portrait of Doniphan and his troops reinforces the importance of the citizen-soldier in American history and provides a new window on the war that changed forever the hopes and dreams of our border nations.