Nice! I just joined this server and get ban for no reason. Good Job!
Did you read the rules?
(3 max on attackers' side with.. fewer players.. more players 5 max on attacker's side)
They used to swap/kick people, when there were too many commanders.
This, however, proved unworkable, as most people simply ignored administration and rejoined the attackers.
I'm sure this is why Cenkris, Harvain etcetera decided to immediately use temp bans (or maybe even perm bans), because it simply took too long to moderate.
The problem here is, that it is very much possible that the wrong guy gets banned.
Even if you join as first commanders (and are allowed to stay there), you might get killed a few times without getting kills yourself.
For an administrator it's near impossible to see who's actually an allowed commander and who's not.
Mistakes can happen this way.
I noticed them banning players a lot faster and twas the reason for my post to compliment them, because it somewhat points to a big workload.
Try again in a few hours, probably only a temporarly ban.. and be honest, if you simply missed the rules