After seeing a plane carrying a banner saying to join someone's clubhouse, the Eds decided to make their own club. After spending the better part of a day painfully building the treehouse, they finally complete it, although it isn't nearly like they had originally planned. After bringing the other kids over to see their latest creation, they are shocked to find their clubhouse that they worked so hard on, had been taken over and redesigned by the Kanker Sisters. Humiliated, Eddy declares war to drive the Kankers out of the clubhouse.
The Battle itself
Eddy and Edd began the battle by trying to surprise the Kankers, but blew their cover when the Kankers saw them on their line and made them get stuck. Next, they used water balloons, but that backfired when the water balloons created a pile on the deck, and the Kankers fired back and all but Edd got hit. Eddy then told Ed to throw him to the club, but Ed threw him through the floor and Eddy was beat up and thrown to the thorn bushes for not bringing flowers. Ultimately, the Kankers were the victors.
The other Eds abandoned the battle to find their comrade and spent the rest of the day tending to Eddy's wounds.