During World War I, the division was involved in the Meuse-Argonne, Champagne-Marne, Aisne-Marne including the Battle of Fismes and Fismette, Oise-Aisne, and Ypres-Lys (FA) operations. During the war, it took a total of 14,139 casualties (2,165 killed and 11,974 wounded). 2 individuals received the Medal of Honor: Sergeant James I. Mestrovitch, Company C, 111th Infantry; and Major Joseph H. Thompson, Headquarters, 110th Infantry. More detail about the history of the division during World War I can be found in Edward Martin's "The Twenty-Eighth Division: Pennsylvania's Guard in the World War".