A reference via the website of Clan Maitland contains a bit on General Peregrine Maitland (brother-in-law of James Austen, I believe):

http://www.lauderdale.u-net.com/a_short_account_of_the_maitlands.htm#19th%20Century

Sir Peregrine Maitland had an astonishing military career. He was born July 6, 1777 at Longparish House, in Hampshire, and joined the army when he was only fifteen. Within two years he was a captain. When war broke out with France, promotions came quickly. At the Battle of Waterloo in 1815, he was a Major-General and was placed by Wellington in charge of the famed 1st Brigade of Guards (later named the Grenadier Guards). He is known for Wellington’s words: "Now, Maitland, now's your chance". At that Maitland gave his order: "Up Guards and at em". The resultant volley from his regiment at a range of 20 yards destroyed the French Imperial Guard, and was the decisive moment of the Battle of Waterloo. Romance has, however, contributed a little glamour. Maitland had proposed to the daughter of the Duke of Richmond at the Duchess' Ball on the eve of the Battle of Waterloo. As an officer living on his pay, Maitland was not considered a suitable match, but Wellington interceded for him with the Duke of Richmond. The young couple were forgiven by the Duke, who was about to go to Canada to become Governor-in-Chief, packed up his son-in-law and brought him out to be Lieutenant-Governor of Upper Canada. He governed from 1818 to 1828. If Sir Peregrine Maitland was ever popular, it was only with the upper class. When Sir Peregrine was recalled to England, the feeling at his departure was mainly one of open relief. He was appointed to a series of highly influential positions by the British government including the post of Lieutenant-Governor of Nova Scotia (settlements of Canada are named after him) and Governor of the Cape of Good Hope ( a suburb of Capetown is named after him). He died in 1854 at the age of 76 in his home in Eaton Place in London. Sir Peregrine's forebears are believed to be from the Pittrichie branch of the Aberdeenshire Maitlands.

[taken from the page above, 30 December 2001]