Fought a battle while enlisted with Robb, attacking Banefort
The troops on both sides went right for the castle walls, and just pushed and shoved against it. They ignored the ladder up, and after I managed to smash(!) the gate with my axe, they still wouldn't go inside. Like a bottle-neck effect, only one or two soldiers at the time found their way through the wide-open gate, and became easy pickings once inside. I was finally knocked out (trying to just take the fort on my own), and after being too wounded to fight, the battle was automatically resolved (after I actively retreated from it)
While waiting, considering to retreat, neither side seemed able to figure out how to reach each others through the castle wall, continously ignoring the gate and the ladder.
same on harenhall