He knew there would be a withdrawal, which is why He issued the warning to flee.
The Judean Christians recognized and seized the opportunity, and survived, exactly as Jesus intended.
Zech 14 says they will flee also corresponding to Jesus. So why do you believe the king of the north would withdraw when he is trying to kill as many people as he can in the middle east? And do you also believe Egypt was overthrown at that time and do you believe the resurection of Israel took place at that time as Daniel prophecied?
Daniel 11:42 He will extend his power over many countries, and not even the land of Egypt will escape.
Daniel 11:43 He will gain control of the treasures of gold and silver and over all the riches of Egypt, and the Libyans and Cushites will also submit to him.
Daniel 11:44 But news from the east and the north will alarm him, and he will go out with great fury to destroy many and devote them to destruction.
Daniel 11:45 He will pitch his royal tents between the sea and the beautiful holy mountain, but he will meet his end with no one to help him.
Daniel 12:1 "At that time Michael, the great prince who stands watch over your people, will rise up. There will be a time of distress, the likes of which will not have occurred from the beginning of nations until that time. But at that time your people--everyone whose name is found written in the book--will be delivered.
Daniel 12:2 And many who sleep in the dust of the earth will awake, some to everlasting life, but others to shame and everlasting contempt.
I just have a hard time believing the first resurection took place in 70 AD.