[6] Pope Pius VI was impressed by the conduct of the regiment and ordered that medals be awarded to its officers.

At the Battle of Waterloo in June 1815, the regiment charged down the slope to support the Union Brigade of medium cavalry.

[22] The regiment was deployed to South Africa for service in the Second Boer War in October 1899, and took part in the relief of Kimberley and the ensuing Battle of Paardeberg in February 1900.

Almost 530 officers and men left Cape Town aboard SS Lake Manitoba in September 1902, arriving at Bombay the following month and was then stationed at Ambala in Punjab.

[26] The 9th/12th Royal Lancers celebrated Mons/Moy Day annually, which commemorated the last occasions on which each predecessor regiment charged with lances.

[28] Late in 1934, the 12th exchanged equipment and station with the 11th Hussars, taking over 34 Lanchester 6×4 armoured cars at Tidworth.

[28] In January–February 1935 a provisional D squadron of the 12th Lancers with eight armoured cars served as a peacekeeping force in the Saar region.

[29] On 31 December B and C squadrons were sent again to Egypt with 29 armoured cars as a response to the Italian invasion of Abyssinia and strengthening garrisons in Libya.

[30][31] The 12th Lancers was an armoured car regiment equipped with the Morris CS9, in the 1940 campaign in France and Flanders, playing a key part in shielding the retreat to Dunkirk.

Subsequently, the regiment fought as divisional troops for the 1st Armoured Division at the Second Battle of El Alamein in October 1942[33] and then served as a corps-level reconnaissance unit in the Italian Campaign.