World War I: Allied forces led by the Australian general John Monash won the Battle of Hamel, demonstrating the effectiveness of combined-arms techniques in trench warfare.

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. Main areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. There were important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, plus another 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

The Allies or the Entente was an international military coalition of countries led by the French Republic, the United Kingdom, the Russian Empire, the United States, the Kingdom of Italy, and the Empire of Japan against the Central Powers of the German Empire, Austria-Hungary, the Ottoman Empire, and the Kingdom of Bulgaria in World War I (1914–1918).

General Sir John Monash, was an Australian civil engineer and military commander of the First World War. He commanded the 13th Infantry Brigade before the war and then, shortly after its outbreak, became commander of the 4th Brigade in Egypt, with which he took part in the Gallipoli campaign.

The Battle of Hamel was an attack by Australian Army and US Army infantry, supported by Royal Tank Regiment tanks, against German positions in and around the town of Le Hamel, in northern France, during World War I. The attack was led by Lieutenant General John Monash, commander of the Australian Corps, and took place on 4 July 1918.