The story is filled with so many things that do not make sense.
Liu Bei is on the run from Cao Cao.
Somehow, he managed to persuade 100k civilians to follow him. What is going on here? Is this a scorched earth policy where Liu Bei burn the town and forced civilians to follow him?
The wikipedia says that 100k people follow Liu Bei because Liu Bei is popular. Well, as a civilian, I wouldn't follow a fleeing general just because he is popular. I mean, what am I getting? War loots.
The 100k civilians know they are following Liu Bei and is being chased by Cao Cao. Surely they bring some weapons? No. They are unarmed.
What? A typical family there don't have sword? With proper arm, Liu Bei will easily have 100k armed infantry. That's far more than enough to deal with measly 5k Cao Cao's cavalry.
Then, Cao Cao caught up with Liu Bei. Liu Bei abandoned the 100k men and move somewhere else.
So what happened to the 100 k unarmed men? Did Cao Cao slaughter them all? Did they return to their initial city? Did they follow Liu Bei and sail east?