Gibraltar
In 1770 the regiment was despatched to Gibraltar, sailing from Cork in May. The regiment was augmented by a light infantry company of seventy men in December 1770, and the ten line companies had their authorised establishment raised by twenty-one men.
The regiment remained in the Gibraltar garrison for several years, and was present when Spain declared war on the United Kingdom in June 1779 and the Great Siege of Gibraltar began. At this point, the effective regimental strength was 560 men and 27 officers, around a tenth of the garrison. A relief convoy arrived early in 1780, and a second in April 1781, but supplies remained limited. The commander of the garrison decided late in 1781 to attempt a sortie, and this was launched on the night of 26 November; the flank companies of the 56th were part of the raiding force, and successfully destroyed several batteries of artillery.
The siege was finally lifted in February 1783 – after three years and seven months – when the Treaty of Paris ended hostilities, and confirmed British possession of Gibraltar. The 56th received the battle honour "Gibraltar" for its service in the siege, with the right to bear the castle-and-key insignia on its colours. It was relieved in October 1783, and returned to England. Shortly thereafter the regiment was given a county affiliation, part of a move to increase recruiting by linking regiments to local areas, and became the 56th (West Essex) Regiment of Foot.
In the spring of 1784 it moved to garrison duty in Scotland, serving at various stations there until January 1788, when it embarked for Ireland with a reduced establishment of ten companies. From 1788 to 1793 it was stationed in Ireland.
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