In December 1919, the Army Council decided to combine the School of Instruction for Royal Horse and Field Artillery with the Chapperton Down Artillery School and the Heavy Artillery Training Centre to form an expanded School of Artillery. This took place in 1920; the following year the Siege Artillery School moved to Larkhill from Lydd and was likewise merged into the School. Shoeburyness, though, retained the Coast Artillery School of the Royal Garrison Artillery; in 1940 it moved to Great Orme near Llandudno, where it stayed for the duration of the war, before moving again to the Royal Citadel, Plymouth (where it remained until 1956, when the UK's coastal artillery network was disbanded).