They had been generals in the union army.

他们曾是联邦军队的将军。

In 1863, Tubman became the head of an espionage scout network for the union army.

1863年， 塔布曼成为联邦军队间谍侦察网络的负责人。

It was his duty to be sure that no enemy soldier, dressed in gray, spied on the valley, where the union army was hiding.

他的职责是确保没有一个穿着灰色衣服的敌军士兵监视山谷。

With all this power in its hands the administration was able by January, 1865, to construct a union army that outnumbered the Confederates two to one.

凭借手中的所有这些权力，政府能够在 1865 年 1 月之前组建一支人数超过同盟军的联邦军队。