then let those in Judea begin fleeing to the mountains.

This would be a sure warning for Christians to get out of Jerusalem and the province of Judea then, at top speed, with no unnecessary burdens, by direct route.

As soon as Gallus withdrew, the Christians in Jerusalem left the city for the mountainous region across the Jordan River in the province of Perea. They were saved from death when, four years later, General Titus captured Jerusalem.