Returning to Egypt in December, the regiment was employed with the Western Frontier Force in the Senussi Campaign, before moving to Salonika in February 1916.

One squadron served with the 27th Division from March to June 1916, whilst the regiment remained as GHQ reserve in Macedonia until the end of the war.

Following the experience of the war, it was decided that only the fourteen most senior yeomanry regiments would be retained as horsed cavalry,[9] with the rest being transferred to other roles.

[10] As a result, on 14 July 1921, the regiment was one of eight[a] converted and reduced to 24th (Derbyshire Yeomanry) Armoured Car Company, Tank Corps.

[13] The 1st Derbyshire Yeomanry landed in Tunisia in late 1942 as the reconnaissance regiment of the 6th Armoured Division, fighting at Medjez el Bab.

The 1st Derbyshire then moved to Italy with the 6th Armoured Division, where it saw heavy fighting during May 1944, including action at the Battle of Monte Cassino.

Returning to the United Kingdom in late 1943, the 2nd was assigned to the 51st (Highland) Infantry Division, where it served as the divisional reconnaissance regiment until the end of the war.

The regiment received battle honours for fighting in the Rhineland and the Reichswald in February, and crossed the Rhine in March in Operation Plunder.

[15] The Derbyshire Yeomanry was awarded the following battle honours:[1] South Africa 1900–01 Struma, Macedonia 1916–18, Suvla, Scimitar Hill, Gallipoli 1915, Egypt 1915–16 Dives Crossing, La Vie Crossing, Lisieux, Lower Maas, Ourthe, Rhineland, Reichswald, North-West Europe 1944–45, Alam El Halfa, El Alamein, Medjez el Bab, Tabourba Gap, Bou Arada, Kasserine, Steamroller Farm, Maknassy, Fondouk, Kairouan, El Kourzai, Tunis, North Africa 1942–43, Cassino II, Liri Valley, Aquino, Arezzo, Advance to Florence, Argenta Gap, Fossa Cembalina, Italy 1944–45