Ferdinand Foch (1851-1929) was a key French military commander during World War I. He joined the infantry during the Franco-Prussian War, eventually becoming head of the war college. Named commander of the XX Army Corps at the outbreak of World War I, Foch helped secure victory at the First Battle of the Marne. With the French and English armies in danger of splitting, Foch took command of the Allied forces in March 1918 and withstood the Ludendorff Offensive. Later that summer, his victory at the Second Battle of Marne facilitated the end of the fighting. Among his post-war accolades, Foch was named a British field marshal and marshal of Poland.