Immigrant American soldiers played an important, often underrated role in World War I. Those who were non-citizens had no obligation to participate in the war, though many volunteered. Due to language barriers that prevented them from receiving proper training, they were often given the most dangerous and dirty jobs.

The impetus for this book was the story of Matthew Guerra (the author's great-uncle). He immigrated to America from Italy around age 12. He was drafted into the U.S. Army in 1918 and shipped to France, where he joined the 58th Infantry Regiment of the 4th "Ivy" Division and participated in the St. Mihiel and Meuse-Argonne offensives. Wounded in the Bois de Fays, the 22-year-old Guerra died in a field hospital.