A detailed history of a most distinguished Irish regiment which saw service in both World Wars. - Raised in the northern counties of Ireland in the aftermath of the Boer War. - The first reserve forces unit to see action in the Great War. - The 'one-man regiment' of the 1930s. - Converted to tanks early in the Second World War. - Did the impossible in 1943 when a troop of Churchills climbed the Djebel Ang to support the Irish Brigade. - Supported the Canadians at the battle of the Hitler Line in Italy, May 1944. - Survives in the modern TA as a Squadron of Queen's Own Yeomanry and a Squadron of Royal Signals.