1.Pvt.Chalmers Davis, a mortarman, found an observation post on top of a wrecked house.

1.炮手，列查尔姆斯·戴维斯在一所炸毁的房屋顶上建立炮观测阵地。

2.The front line belong to the men who worked there—rifle-men and machine gunners, mortarman, forward artillery observers, communications men, and medics.

2.前沿地带为作业于此地的人们所掌握——步、机、炮、炮火校射、通讯，以及救护。