The rules additions were an attempt to simulate unit movement in columns and the delay and difficulty of changing formation into a line of battle. Separate counters represented flanks, which could be turned to join adjacent units' flanks or turned back to defend against expected assault.
The rule changes sought to emulate unit movement in columns and the intricacies of transitioning from a formation into battle. Special markers represented flanks that could be rotated to integrate with adjacent units' positions or flipped for defensive purposes.