Douglas Mercer-Henderson

Colonel Douglas Mercer-Henderson CB (? – 21 March 1854) was a British Army officer who fought during the Peninsular War and Waterloo Campaign, later inheriting a castle in Scotland.

He was born Douglas Mercer, the third son of Lieutenant-colonel George Mercer (d. Paris, 1822), by Jean (d. 1814), eldest daughter of Sir Robert Henderson Bt. of the Clan Henderson.

Mercer was appointed an ensign in the 3rd Foot Guards on 24 March 1803 and two years later took part in the expedition to Hanover under Lord Cathcart. Promoted to Lieutenant in 1806, he took part in the 1809 Walcheren Campaign and the following Spring was appointed aide-de-camp (ADC) to Major-general Dilkes, who he accompanied to Cadiz.

In the Autumn of 1810 he went to Portugal and joined the army of Viscount Wellington following the Battle of Bussaco. After travelling to the Lines of Torres Vedras as ADC to Sir Brent Spencer, he was wounded by a gunshot and returned to Lisbon. The following Spring he was again wounded at the Battle of Barrosa.

After a month in England he returned to Portugal and was present at the battle of Battle of El Bodón (1811), the sieges of Ciudad Rodrigo and Badajoz (1812), the battle of Salamanca (1812), the Siege of Burgos (1812) and subsequent withdrawal as well as the battles of Nivelle and the Biddassoa (1813).

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