UK military english soldier T-Shirt

World War I or the First World War, often abbreviated as WWI or WW1, began on 28 July 1914 and ended on 11 November 1918. Referred to by contemporaries as the "Great War", its belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting also expanding into the Middle East, Africa, and parts of Asia. One of the deadliest conflicts in history, an estimated 9 million people were killed in combat, while over 5 million civilians died from military occupation, bombardment, hunger, and disease. Millions of additional deaths resulted from genocides within the Ottoman Empire and the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war.