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 modifications aimed to mimic unit movement in columns and the challenge of transitioning from a formation into battle. Different counters represented flanks that could be rotated to join adjacent units' flanks or turned back to counter potential attacks.