They could not move their heavy mortars over the swampy ground.

他们无法把重型击炮移过那片沼。

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

击炮手，列兵查尔姆斯·戴维斯在一所炸毁的房屋顶上建立炮兵观测阵。

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

前沿带为作业于此的人们所掌握——步枪兵、机枪兵、击炮兵、炮火校射兵、通讯兵，以兵。