Between 2003 and 2009, British troops in Iraq were engaged in a counter-insurgency war. They also helped train local security units, assisted with reconstruction and provided humanitarian aid.
In March 2003, British troops took part in a coalition invasion of Iraq. After a month of combat operations, they overthrew Saddam Hussein's regime and occupied the country.
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 June 1916, a British military mission began recruiting a local force in neutral Persia. Its goal was to bolster Allied interests and prevent enemy influence in the region.
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.
The war against Iraq in 1990-91 saw the largest single deployment of British troops since the Second World War. Altogether, about 35,000 British servicemen and women served in the campaign.