Our eyes do yet fail [in looking] for our vain help: In our watching we have watched for a nation that could not save.
"They hunt our steps ... we cannot go about our streets... our end is come"  (Lamentations 4:18) The siege is over.  The king has fled; the walls are breached; the soldiers of the enemy are in the streets.  Of course, all who are able to do so flee from the city.