The animists did not at all lack the defences of fortifications. In fact, the guild's 3 commodity shed enterances had a total 28k combined fortifications. I doubt there is another guild in Avalon that could have boasted such protection, indeed for a
while even Mercinae's front gate was not that protected.
Second, your point that the Bandit's guild houses were in cities, thus having city fortification to protect us. Well, that only would protect against an 'animist counter assault'. Given that is not at all likely, I don't think it comes into play at
all. Had our target been the Rangers the story would have been different.
Written by my hand on the 16th of Eleuthral, in the year 1055.