Question: The Lion's Mound commemorates the location on the battlefield of Waterloo where a musket ball hit the shoulder of a man that was the Grand Duke of what country?

Context paragraphs:
Tyonajanegen: Tyonajanegen ("Two Kettles Together") was an Oneida woman who fought in the August 6, 1777 Battle of Oriskany during the American Revolutionary War.  Armed with two pistols, she rode into battle and fought alongside her husband, Han Yerry, and her son, Cornelius.  Tyonajanegen helped her husband reload his gun after a musket ball struck him in the wrist.  After the battle she rode on horseback to bring news of the outcome to local rebels and Indians.

Buck and ball: Buck and ball was a common load for muzzle-loading muskets, and was frequently used in the American Revolutionary War and into the early days of the American Civil War.  The load usually consisted of a .50 to .75 caliber round lead musket ball (.69 caliber for the "Brown Bess" musket) that was combined with three to six buckshot pellets.

Duelling pistol: A duelling pistol is a type of pistol that was manufactured in matching pairs to be used in a duel, when duels were customary.  Duelling pistols are often single-shot flintlock or percussion black-powder pistols which fire a lead musket ball.  They were made in identical pairs to put both duellists on the same footing.  Not all fine pairs of pistols are actual duelling pistols, though they may be called so.

Panorama of the Battle of Waterloo: The Panorama of the Battle of Waterloo (French: "Panorama de la Bataille de Waterloo" ) is a rotunda in Belgium that houses a monumental panoramic painting depicting the Battle of Waterloo.  The neoclassical building is located immediately to the north of the Lion's Mound on the battlefield of the Battle of Waterloo in the municipality of Braine-l'Alleud in the Belgian province of Walloon Brabant.

William II of the Netherlands: William II (Willem Frederik George Lodewijk, anglicized as William Frederick George Louis; 6 December 1792 – 17 March 1849) was King of the Netherlands, Grand Duke of Luxembourg, and Duke of Limburg.

Edwin Vose Sumner: Edwin Vose Sumner (January 30, 1797 – March 21, 1863) was a career United States Army officer who became a Union Army general and the oldest field commander of any Army Corps on either side during the American Civil War.  His nicknames "Bull" or "Bull Head" came both from his great booming voice and a legend that a musket ball once bounced off his head.

Lion's Mound: The Lion's Mound (French: "Butte du Lion" , "Lion's Hillock/Knoll"; Dutch: "Leeuw van Waterloo" , "Lion of Waterloo") is a large conical artificial hill located in the municipality of Braine-l'Alleud (Dutch: Eigenbrakel), Belgium.  King William I of the Netherlands ordered its construction in 1820, and it was completed in 1826.  It commemorates the location on the battlefield of Waterloo where a musket ball hit the shoulder of William II of the Netherlands (the Prince of Orange) and knocked him from his horse during the battle.  It is also a memorial of the Battle of Quatre Bras, which had been fought two days earlier, on 16 June 1815.

James Monroe: James Monroe ( ; April 28, 1758 – July 4, 1831) was an American statesman who served as the fifth President of the United States from 1817 to 1825.  Monroe was the last president among the Founding Fathers of the United States as well as the Virginian dynasty; he also represented the end of the Democratic-Republican Generation in that office.  Born in Westmoreland County, Virginia, Monroe was of the planter class and fought in the American Revolutionary War.  He was wounded in the Battle of Trenton with a musket ball to his shoulder.  After studying law under Thomas Jefferson from 1780 to 1783, he served as a delegate in the Continental Congress.

Matthijs Dulken: Matthijs, Matthias or Matheus van Dulcken (died 1634, Winterswijk) was mayor of Roermond in 1610, 1616 and 1629.  In 1627 he was the Spanish governor of Grol (Groenlo), and licentmeester of Upper Guelders.  He commanded Groenlo during the 1627 siege by Frederick Henry and, though wounded by a musket ball, he survived the battle and on 19 August that year signed the agreement that handed the town over to States troops.  After his final year as mayor in 1629 he served for a period as schepen.  He married Helwich van Wessum and they had one son, Christophorus, in 1593.

Battle of Portland: The naval Battle of Portland, or Three Days' Battle took place during 18-20 February 1653 (28 February – 2 March 1653 (Gregorian calendar)), during the First Anglo-Dutch War, when the fleet of the Commonwealth of England under General at Sea Robert Blake was attacked by a fleet of the Dutch Republic under Lieutenant-Admiral Maarten Tromp escorting merchant shipping through the English Channel.  The battle failed to settle supremacy of the English Channel, although both sides claimed victory, and ultimate control over the Channel would only be decided at the Battle of the Gabbard which allowed the English to blockade the Dutch coast until the Battle of Scheveningen, where Admiral Maarten Tromp would meet his fate at the hands of an English musket ball.  As such, it can be considered a slight setback for the English nation and another example of Dutch superiority regarding pure seamanship at the time.  It also illustrated England's drive to control the seas, which would ultimately allow it to become the prime maritime power of the world.

Supporting paragraphs: Lion's Mound William II of the Netherlands
Answer: Luxembourg