I believe that it should be handled by if by one player:
1st Offense: Slay of the player leaving the enemy team one more spawn less.
2nd Offense: kick/temporary ban from the event.
3rd Offense: Ban from the event until his/her regiment leader contacts you about their behavior.
IF a whole regiment is a problem:
1st Offense: A solid reminder of the rules
2nd Offense: A slay of the whole regiment(each member) at least once to lower the number of spawns the team has.
3rd Offense: A temporary removal from the event
4th Offense: A Permanent removal from the event unless admin(s) see fit to allow them back.
Of course these are just basic ways to handle the event, and extra rules and Offenses can be handled differently and accordingly. This is just a black and white outline. Just figure a way to color it up
Also, the rule that is the line is 2 or less guys that they should charge. This creates that rambo situation that everyone hates. Instead I believe that those members should have to return to one of their flags and either await reinforcements or join up with one of their regiment lines.