In this lesson, students learn about World War I through the ancestry of  Bill O’Reilly. O'Reilly is a descendant of Irish immigrants, and his grandfather — John O’Reilly III — served in WWI  in the 307th Infantry. The 307th was part of the “Melting Pot” division, largely composed of the children of New York City’s immigrants, including the Irish. During John’s service, he fought in one of the war’s most pivotal battles: the Meuse-Argonne Offensive of 1918.