Background
Source: Wikipedia
General Alexander Cavalié Mercer (28 March 1783 – 9 November 1868) was a British Army officer of the Royal Horse Artillery. He is most notable as commander of G Troop Royal Horse Artillery at the Battle of Waterloo, and as author of Journal of the Waterloo Campaign. Mercer's six-gun horse artillery troop arrived too late for the Battle of Quatre Bras, but it fought with the cavalry rearguard covering the army's retreat to Waterloo.
