Britain claimed it was entitled to do this under its defence treaty with Iraq .
On 18 April , Britain reacted by landing the Indian 20th Infantry Brigade at Basra , the first elements of Iraqforce .
Britain claimed Britain was entitled to do this under Britain 's defence treaty with Iraq .
On 18 April , Britain reacted by landing the Indian 20th Infantry Brigade at Basra , the first elements of Iraqforce .