The troops that get in last 10 or 15 minutes... can't remeber which. You can't kill them by straffing the maproom and there is no such thing as re-setting the maproom by having friendly troops run in behind the enemy troops (they all just hang out there getting drunk together). Whoever gets the tenth troop in gets the capture.
And might I add... it's the 10th ENEMY troop that gets the capture.
Say a Knit base is under attack.
The Bish. drop troops and 9 make it in.
Then a Rook comes and drops 1 troop.
The Rooks gets the capture.
(this was figured out a few months back)