World War I, which lasted from July 1914 to November 1918, was, at the time, the largest single war ever to have occurred. There were a large number of allies on each side of the conflict, and their geographical location and that of their imperial provinces meant that parts of the war were fought all over Europe, and in other places such as North Africa and the Middle East. A battle is a smaller conflict between two military enemies that often makes up part of a war. This is a list (though not exhaustive) of the battles of World War I, in chronological order. They are organized as to the opening date of the battle.