The Battle of Queenston Heights was part of the War of 1812. It took place on the American-Canadian border near Niagra Falls. This is one of the messier wars in American history. Like the Seven Years War (called the French and Indian War in the US) it was actually a global conflict between the British and French Empires.
The gentleman taking a bullet above is Sir Isaac Brock, the battle’s most memorialized casualty.
Sources:
Canadian Encyclopedia- The battle
National Park Service- The War