As someone who oocly told the general of Sirion to do that exact move, let me tell you why I told him to do it. At the time, Sirion couldn't breach the city at all. Oligarch had 4 infantry RCs and 1 archer RC. With so many infantry guarding the city, it was not possible for Sirion+allies to breach the city with their noble count at the time. Their issue wasn't that they were not bringing enough CS. They were. The problem was how broken militias were. The biggest problem with militia units are that despite the game losing many players, militias were not nerfed at all. Back in the days when we had realms that had more than 50 characters, militias were nice addition to your defense. Now with less people around, militias are pretty much your main source of defense. Some realms have more militia CS in one region than their entire mobile army CS at this point. The game never was designed to be played with so few people. The battle system is utterly broken because we lack people. Archers are doing so well because with so few people to recruit infantry, you can just mow them down with archers before they even get near you. If we have double the number, we wouldn't be seeing archers dominating the game to this degree. Anyway back to where I began, since militias were so problematic, the only way to siege the city was to screw militias over first by using their predictable pattern against them.
As for the tactic, not sure why you think it would be an abuse. They have no commander. That is why they can't be placed where you want. They should be weakened a lot more than now to match the game's reduced noble count/mobile CS. Otherwise there should be different ways to besiege fortified regions. The game doesn't provide any other alternative but to use the dumb behaviour against itself.
