The First World War was the first truly global conflict. From 1914 to 1918, fighting took place across several continents, at sea and - for the first time - in the air. It cost the lives of over ten million soldiers.
Throughout the First World War, British Empire soldiers fought a guerrilla campaign against a small German force in East Africa. Led by Colonel Paul von Lettow-Vorbeck, the Germans inflicted many casualties and avoided defeat in the field.
During 1914-18, British troops fought the Turks in Mesopotamia. After many setbacks, they finally took Baghdad in March 1917. This marked the high point of a long and tragic campaign fought in a harsh climate.
In 1918, the British assembled a handpicked unit to carry out a daring secret mission to the Caucasus. Their aim was to unify into an effective force the various anti-Bolshevik and anti-Turkish groups fighting there.
In February 1916, the Allies finally completed the conquest of Germany’s West African colonies. One of the First World War’s forgotten sideshows, this campaign was fought in hostile terrain and disease-ridden jungles.
From 1915 to 1918, British troops were part of a multi-national Allied force fighting the Bulgarians and their allies in the Balkans. Despite harsh conditions, they eventually brought the campaign to a successful conclusion.
Gallipoli was the first major amphibious operation in modern warfare. In 1915 British Empire and French troops landed on the Ottoman-held peninsula in the Dardanelles Straits with disastrous consequences for the Allies.
On 9 July 1915, enemy forces in German South-West Africa (now Namibia) surrendered to the Allies. This marked the final stage of a short but successful campaign of manoeuvre fought in extremely harsh conditions.