The people fled - This was a natural inference from the change of direction, which indicated a determination to escape from Egypt. Up to the time when that information reached Pharaoh both he and his people understood that the Israelites would return after keeping a festival in the district adjoining Etham. From Etham the intelligence would be forwarded by the commander of the garrison to Rameses in less than a day, and the cavalry, a highly-disciplined force, would be ready for immediate departure.
Related Commentaries of Exodus 14:5
Exodus 14:5
5 And it was told the king of Egypt that the people fled: and the heart of Pharaoh and of his servants was turned against the people, and they said, Why have we done this, that we have let Israel go from serving us?