This was probably a first in history where millions of soldiers entered the city as thieves.
In older generations, old armies were usually associated with looting, burning, and killing. They were never related to "stealing"...
That being said, everything that was happening could not slip past a person's eyes!
It was the Eastern Pharos who was mysterious in his whereabouts.
As for Cang Lang, the highest commander of the million-strong army, it was currently standing on a hill as it watched over the big city where the thievery was going on.