In July 1916, 4th Mounted Division became 2nd Cyclist Division and the regiment was converted to a cyclist unit in 5th Cyclist Brigade at Great Bentley. In November 1916, the division was broken up and the regiment was merged with the 2/1st Surrey Yeomanry to form 8th (Surrey and Sussex) Yeomanry Cyclist Regiment in 3rd Cyclist Brigade at Ipswich. In March 1917, it resumed its identity as 2/1st Sussex Yeomanry at Ipswich, and later moved to the Woodbridge area. In April 1918, the regiment moved with 3rd Cyclist Brigade to Ireland, landing in Dublin on 21 April. Initially, it was stationed at Clandeboye and in September 1918 to Boyle; there was no further change before the end of the war.
