The 50th (Queen's Own) Regiment of Foot was an infantry regiment of the British Army from 1755 to 1881.
A second battalion was raised, serving from 1804 to 1814; it saw action at Walcheren, as did the first battalion.
After a battle in the Peninsular War, the regiment was nicknamed the Dirty Half-Hundred; the regiment had worn uniforms with black facings, and when they wiped sweat away with their cuffs the dye stained their faces. (Half-hundred is a play on "fifty")
In 1827 they were retitled 50th (Duke of Clarence's) Regiment of Foot, in honour of the future William IV of the United Kingdom, and then as the 50th (Queen's Own) Regiment of Foot in 1831 in honour of William's wife, Queen Adelaide.
They travelled to Australia in detachments in the 1830s as escorts to prisoners, and then to India in 1841
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there has been an error in their copying:
that reference: the 1st 3 pages are for a chap called William Bethell BUT the remaining 10 are for your chap