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

迫击炮手，列查尔姆斯·戴维斯在一所炸毁的房建立炮观测阵。

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

带为作业于此的人们所掌握——步枪、机枪、迫击炮、炮火校射、通讯，以及救护。