You have 2 minutes in which to conquor the enemy, do not fail or your enemy will gain greatly. Watch out, if you get hit, your enemy will gain points and you wont have a second chance. If you manage to hold them off for the whole 2 minutes, you will gain almost as many points as if you manage to eliminate the attacking teams totally. Do NOT attempt to charge the attackers, as if you leave your base, you will be removed from the competition. As with the attackers, if you are hit, you will not return.
Positions cycle every round.
The team with the highest score at the end, wins. For anyone who wishes to make a 3rd party map for seige mode in time for the release of the server dll, the concept is simple. Make a base and an area for attackers to spawn. Make the defenders spawnpoints be teamnumber 1, and attackers teamnumber 2 and 3. Multiple flags work the same way as in normal paintball, but leave the teamnumber 0 or blank.