The 45th (Nottinghamshire) Regiment of Foot was a British Army line infantry regiment, raised in 1741. The regiment saw action during Father Le Loutre's War, the French and Indian War and the American Revolutionary War as well as the Peninsular War, the First Anglo-Burmese War and the Xhosa Wars. Under the Childers Reforms it amalgamated with the 95th (Derbyshire) Regiment of Foot to form the Sherwood Foresters in 1881.

Father Le Loutre's War (1749–1755), also known as the Indian War, the Mi'kmaq War and the Anglo-Mi'kmaq War, took place between King George's War and the French and Indian War in Acadia and Nova Scotia.c On one side of the conflict, the British and New England colonists were led by British officer Charles Lawrence and New England Ranger John Gorham. On the other side, Father Jean-Louis Le Loutre led the Mi'kmaq and the Acadia militia in guerrilla warfare against settlers and British forces. At the outbreak of the war there were an estimated 2500 Mi'kmaq and 12,000 Acadians in the region.