Unit History: Third Infantry Division
The British 3rd Infantry Division, known at various times as the Iron Division, 3rd (Iron) Division or as Iron Sides, was originally formed in 1809 by Arthur Wellesley, 1st Duke of Wellington for service in the Peninsula War, and was known as the "Fighting 3rd" under Sir Thomas Picton during the Napoleonic Wars. The division is also sometimes referred to as the "Iron Division", a nickname earned during the bitter fighting of 1916, during World War I. The division’s other battle honours include: the Battle of Waterloo, the Crimean War, the Second Boer War, the Battle of France (1940) and D-Day (1944). It was commanded for a time, during World War II, by General Bernard Montgomery. The division was to have been part of a proposed Commonwealth Corps, formed for a planned invasion of Japan in 1945-46, but was disbanded when the war was ended by the bombing of Hiroshima and Nagasaki.
During World War II, the insignia became the "pattern of three" — a black triangle trisected by an inverted red triangle.