The cavalry were advancing.是什么意思？

The cavalry were advancing.

骑兵队伍正在挺进。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

cavalry

n. 骑兵（队），骑兵部队，装甲部队，骑者；

例句
He was arguing with the King about the need to maintain the cavalry at full strength...
他正和国王讨论保留骑兵全部力量的必要性。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

advancing

n. 进步，超前，提前，推进；v. （使）前进( advance的现在分词 )，（使）发展，促进，提高；

例句
Reports from Chad suggest that rebel forces are advancing on the capital...
来自乍得的报告显示叛军正向首都推进。