They follow, equipped in this fashion, in rear of the slaves, keeping a sharp lookout upon them all.

他们以这种方式跟在奴隶身后，密切注视着他们所有人。

The door, through which Burch and Radburn entered, led through a small passage, up a flight of steps into a yard, surrounded by a brick wall ten or twelve feet high, immediately in rear of a building of the same width as itself.

Burch 和 Radburn 进来的那扇门穿过一条小通道，走上一段台阶进入一个院子，院子周围是一堵十或十二英尺高的砖墙， 就在一座与它同样宽度的建筑物的后面。