Then in April 1917, they were sent to serve in the Mesopotamia Campaign.

They were then sent to take part in they Mesopotamia Campaign.

They then served in the 33rd Indian Brigade, 12th Indian Division during the Mesopotamia Campaign.

During the First World War, the regiment served in the Mesopotamia Campaign.

The 14th Indian Division was formed during World War I, for service in the Mesopotamia Campaign.

Following their unexpected success in Mesopotamia Campaign, the British command reconsidered their plan in favour of aggressive operations.

In World War I they served on the Western Front and in the Mesopotamia Campaign.

When the two hussar regiments left for the Mesopotamia Campaign in 1915, only one regiment, the 21st Lancers, remained.

During World War I they were attached to the 17th Indian Division in the Mesopotamia Campaign.

During World War I they took part in the Mesopotamia Campaign.