There were six regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

s in the 2nd Guard Cavalry

Cavalry

Cavalry or horsemen were soldiers or warriors who fought mounted on horseback. Cavalry were historically the third oldest and the most mobile of the combat arms...

 Division: Horse Grenadier Guards

Horse Grenadier Guards

The Horse Grenadier Guards were a series of cavalry troops in the British Household Cavalry between 1687 and 1788, who used grenades and other explosives in battle. Originally attached to the Horse Guards, they became independent for a century before being disbanded...

 Regiment (Leib-Gvardii Konno-Grenaderskii Polk), Her Majesty's Lancer

Lancer

A lancer was a type of cavalryman who fought with a lance. Lances were used in mounted warfare by the Assyrians as early as and subsequently by Greek, Persian, Gallic, Han-Chinese, nomadic and Roman horsemen...

 Guards Regiment (Leib-Gvardii Ulanskii Eia Velichestva Gosudaryni Imperatritsy Aleksandry Feodorovny Polk), Dragoon Guards Regiment

Dragoon guards

Dragoon Guards was the designation used to refer to certain heavy cavalry regiments in the British Army from the 18th century onwards. While the Prussian and Russian armies of the same period included dragoon regiments amongst their respective Imperial Guards, different titles were applied to these...

 (Leib-Gvardii Dragunskii Polk), His Majesty's Hussar Guards Regiment (Leib-Gvardii Gusarskii Ego Velichestva Polk), His Majesty's Lancer Guards Regiment (Leib-Gvardii Ulanskii Ego Velichestva Polk), and Grodno Hussar

Hussar

Hussar refers to a number of types of light cavalry which originated in Hungary in the 14th century, tracing its roots from Serbian medieval cavalry tradition, brought to Hungary in the course of the Serb migrations, which began in the late 14th century....

Guards Regiment (Leib-Gvardii Grodnenskii Gusarskii Polk).