Forward observers learned to call for delayed fuses, so that shells penetrated several floors and exploded right among the enemy rather than detonating on rooftops.

• 前沿校射观测学会了要求炮兵延迟引信，使曲射的炮弹贯穿几层楼板，准确地爆炸在敌军之中，而不是在楼顶爆炸。