The formation of blue soldiers are using their bayonets the normal way - standing at a right angle to the enemy, with their feet squarely apart. The formation of red soldiers on the right are using a technique said to have been used at at the Battle of Culloden. The red soldiers are thrusting their bayonets to the right instead of straight ahead. This movement is accomplished by only moving the rear foot half a pace backwards.
The theory behind the technique is that a soldier armed with a musket and bayonet may be at a disadvantage when charged at directly by a highlander armed with a sword and targe. The highlander would have a chance to deflect the bayonet with his targe and then close in for the kill. In theory, a soldier would have a better chance at bayoneting the highlander that was charging the soldier on his right. In this way the bayonet would pierce the (right handed) highlander's unprotected side. This technique would obviously require training and nerve - as the soldier's life would depend on his neighbour bayoneting the highlander that was actually charging himself.
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