but when the governor at stettin , several hundred miles from the battlefield and as yet wholly ignorant of what had occurred , indignantly refused this charming request , the iron beneath the brass plating was revealed : two days later there were thirty dragons and thirty guns and five thousand men outside the walls , busily digging trenches and piling up bombs in very noticeable heaps for a full assault , and the governor meekly handed over the keys and his garrison .