Kneeling, At the Ready
Soldiers were formed in square with a double row of bayonets facing outward. Horses instinctively veer away from this gleaming double row of sharpened points, and the Cavalry cannot press home the charge. These tightly packed formations, however, were extremely vulnerable to canon fire, and Napoleon, even at Waterloo, retained a prized and highly trained artillery. For this reason, the allies formed square over a ridge, on a reverse slope from the French canon. The artillery barrage carried mostly over their heads and beyond the position.
The regiments could maintain the square formation to repulse French Cavalry, then shift formation to line, march up to the ridge and stop the French infantry charge with volley fire

Blackwatch kilt, red Tunic with sky blue cuff and collar.