What does the phrase “Their ranks will swell but their tread will no longer shake the Earth as it once did” convey in the context of the passage?

What does the phrase “Their ranks will swell but their tread will no

1.	What does the phrase “Their ranks will swell but their tread will no longer shake the Earth as it once did” convey in the context of the passage?
Answer» What does the phrase “Their ranks will swell but their tread will no longer shake the Earth as it once did” convey in the context of the passage?