Final answer:
General Edward Pakenham, the Duke of Wellington's brother-in-law, died in the Battle of New Orleans, the final major conflict of the War of 1812, leading to an American victory under Andrew Jackson.
Step-by-step explanation:
The Duke of Wellington's brother-in-law, General Edward Pakenham, died in the Battle of New Orleans in North America. This battle, which took place on January 8, 1815, was the last major conflict of the War of 1812 between the United States and Britain. As a matter of fact, it occurred after the Treaty of Ghent had been signed to end the war, but the news had not yet reached the combatants. This late engagement resulted in a definitive victory for the American forces under the command of Major General Andrew Jackson, despite being outnumbered by the British forces led by General Pakenham, who was killed in action during the battle.
The Battle of New Orleans has been regarded historically significant because it took place at a time when delicate negotiations had already concluded, yet it continued to affect national pride and the perception of the war's outcome. The battle remains a prominent example of the complications that slow communication could cause in wartime during the era.