The 2nd Infantry Brigade was a regional brigade of the British Army, active since before the First World War. It was the regional formation of the Army in the South East of England–the Brigade commanded and administered soldiers throughout Kent, Surrey and Sussex–but also Brunei. In December 2014 the Brigade merged with 145 (South) Brigade to form Headquarters 11th Infantry Brigade and Headquarters South East.

The 1st Division is an infantry division of the British Army that has been formed and disestablished numerous times since 1809 and is still currently active as the 1st Division. Lieutenant-General Arthur Wellesley raised the division for service in the Peninsular War, which was part of the Coalition Wars of the Napoleonic Wars. The division was disestablished in 1814 but reformed the following year for service in the War of the Seventh Coalition. It then fought at the Battle of Waterloo, where it repulsed numerous attacks, including the final attack of the day that was launched by the French Imperial Guard. Following the battle, the division marched into France and became part of the Army of Occupation before being disbanded a few years later.