This study first offers a political, social, and economic overview of Texas during the first two decades of the twentieth century, including reaction in the Lone Star state to the declaration of war against Germany in April, 1917; the fear of saboteurs and foreign-born citizens; and the debate on raising a wartime army through a draft or by volunteerism. Then, focusing in-depth on northwest Texas, the study examines the Texas National Guard unit recruited there, the Seventh Texas Infantry Regiment. Using primarily the selective service registration cards of a sample of 1,096 members of the regiment, this study presents a portrait of the officers and enlisted soldiers of the Seventh Texas based on age, occupation, marital status, dependents and other criteria, something that has not been done in studies of World War I soldiers. Next, the regiment's training at Camp Bowie, near Fort Worth, Texas, is described, including the combining of the Seventh Texas with the First Oklahoma Infantry to form the 142nd Infantry Regiment of the Thirty-Sixth Division. After traveling to France and undergoing nearly two months of training, the regiment was assigned to the French Fourth Army in the Champagne region and went into combat for the first time. The study examines the combat experiences of these soldiers from northwest Texas and how they described and expressed their experiences to their families and friends after the armistice of November 11, 1918. The study concludes with an examination of how the local communities of northwest Texas celebrated the armistice, and how they welcomed home their "soldier boys" in the summer of 1919. This study also charts the changing nature of the Armistice Day celebrations and veteran reunions in Texas as time passed, as well as the later lives of some of the officers and men who served with the regiment.