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.
The initial attack by Napoleon's troops on the left side of the Allied line prompted the regiment to charge the leading French column. The resulting disarray among the French forces allowed the Scots Greys to exploit the situation, passing through the disorganized ranks and pressing their advantage.