Millions of men, renouncing their human feelings and reason, had to go from west to east to slay their fellows, just as some centuries previously hordes of men had come from the east to the west, slaying their fellows.
There are no more uses of "horde" in the book.
Show samples from other sources
A horde of reporters descended on the small town.
Nobody could withstand Genghis Khan and the Mongolian horde.