At the outbreak of World War I in August 1914, Brauchitsch had reached the rank of captain. He was appointed staff officer to the XVI Army Corps, stationed near Metz. During World War I, he served with the 34th Infantry Division and Guards Reserve Corps. Between 1914 and 1916, he took part in the Battle of Verdun and Battle of the Argonne Forest. In the remaining two years of the conflict, Brauchitsch took part in the Third Battle of the Aisne, the Aisne-Marne offensive, the Second Battle of the Aisne, the Battle of Armentières, and the Battle of Flanders. Brauchitsch was awarded the Iron Cross 1st Class and the House Order of Hohenzollern, and ended the war with the rank of major.