Ottoman cavalry in Palestine, National Library of Israel (Source: Wikipedia)
This section contains a brief introduction to the main campaigns which took place away from the Western Front, arranged by area.
These campaigns in South Eastern Europe were about alliances: the Entente Powers sought to create access to Russia, while the Central Powers sought to link up with their Ottoman allies.
For Britain, control of Mesopotamia meant control of the land route to its Indian colonies. Persia was neutral but was the only source of oil for the British fleet. Iraq and Iran suffered.
The First World War was truly global. There were land engagements in Eastern Europe, the Caucasus, Italy, Serbia, Romania, the Middle East and Africa, and naval actions in every ocean.