A brigade is a major tactical military formation that is typically composed of three to six battalions plus supporting elements.
The Royal Navy (RN) is the United Kingdom's naval warfare force.
The Western Front was the main theatre of war during the First World War.
World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
The 3rd (Royal Marine) was an infantry brigade of the Royal Marines.
The 4th (City of London) Battalion, London Regiment (Royal Fusiliers) was a Volunteer unit of Britain's Territorial Army (TA) recruited from East London.
The 63rd (Royal Naval) Division was a United Kingdom infantry division of the First World War.