World War I: U.S. Marine Corps suffers its worst single day's casualties during the Battle of Belleau Wood while attempting to recapture the wood at Château-Thierry (the losses are exceeded at the Battle of Tarawa in November 1943).

World War I, or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Major theatres of war included Europe and the Middle East, and well as parts of Africa and the Asia-Pacific. One of the deadliest conflicts in history,…