Amalgamation
On 23 April 1968, following the publication of the following notice in the London Gazette:
By virtue of the provisions of the Royal Warrant dated 5th April, 1968 (published in Army Order 18 of 1968) all officers of the Land Forces belonging to The Royal Northumberland Fusiliers (5th), The Royal Warwickshire Fusiliers (6th), The Royal Fusiliers (City of London Regiment) (7th), and The Lancashire Fusiliers (20th) are transferred to the Royal Regiment of Fusiliers with effect from 23rd April, 1968.The regiment was amalgamated into the new Royal Regiment of Fusiliers.
Read more about this topic: Royal Northumberland Fusiliers