A Royal Naval Division—later designated the 63rd (Royal Naval) Division—was formed in the First World War to make use of surplus reserves of the Royal Navy who were not required at sea. It included two naval brigades and a brigade of Royal Marines, and fought in the defence of Antwerp in 1914, the Battle of Gallipoli in 1915, and the Battle of the Somme in 1916. Few naval personnel remained in the Division by July 1916, and it was redesignated as the 63rd Division. The division was demobilised in April 1919.