Pandemonium. We were the strongest back then, and nobody was ever kicked. Before guild allies were introduced into the game AS WE KNOW THEM, we had to manually form alliances. When Pandemonium and iBall were competing, a few members in each guild wanted to be allies. This meant that we would not attack each other, no matter what.

If you look on the leaderboards, iBall and Pandemonium were very successful for their time, and over time, leaderships changed and they allied. Now it's a dead family guild that nobody ever tags on.
If they were to both start back up, and remain alliances, with two of the original members, they would for sure take towers separately, like we did over a year ago.

Don't assume that all tower guilds use the sub system.