The sand plain before the city's entrance was quickly covered in blood and limbs, but quickly enough, the rate of massacre slowed down to a crawl as the defenders organised appropriately, forcing the attackers to calm their aggression, by emitting vapour around themselves, the arm-bearers of the city were able to countering the mirages casted by the illusory followers, although it wasn't perfect and consumed an awful lot of vapour, it was worth to allow them to actually see where their enemies were and not be troubled by false visions.
That way of doing things might have normally gotten them defeated, but their numbers were great enough to push back the malevolent union of the three wandering faiths, if anything, the aggressors would have to retreat soon.
The commotion inside of the city seemed to have died down as well, meaning that the enemies who had snuck inside had been dealt with.