The regiment embarked for the continent again in May 1815 for service in the Hundred Days campaign. The regiment had a key role in the Battle of Quatre Bras on 16 June 1815 as one of the regiments defending the disputed crossroads and which later halted a French attack with a bayonet charge. Two days later the regiment was in action again at the Battle of Waterloo. At an early stage, Napoleon's troops attacked the left of the Allied line, and the regiment was ordered to charge the leading French column. The regiment did so and the French column then broke in disorder. The horses of the Scots Greys passed through the regiment to get to the scattering French troops and press the advantage. At this point some members of the regiment clung to the stirrups of the passing Greys so that they could reach the French troops. Corporal Dickson of "F" Troop of the Scots Greys, reported: "They were all Gordons, and as we passed through them they shouted 'Go at them the Greys! Scotland for ever!' My blood thrilled at this and I clutched my sabre tighter. Many of them grasped our stirrups and in the fiercest excitement, dashed with us into the fight." After the battle, the regiment marched to Paris and then embarked for home in December 1815. After arriving in Edinburgh on 7 September 1816, it was cheered by a large crowd.