《三国志·魏书·二公孙陶四张传》
等大雨停了，司马懿就下令在城周围堆起土山，修建望楼，还制造了可以连续发射石头的弓弩，往城中发射石头。
雨霁，起土山、脩橹，为发石连弩射城中。
When the heavy rain stopped, Sima Yi ordered that mounds of earth be piled up around the city, watchtowers be built, and ballistae that could fire stones continuously be made to fire stones into the city.