Luciana's powers kick in at the right moment, and the hunters slow down until losing any will to fight. Some start dropping weapons, and the attack becomes bearable.
We are stronger, but there are many more of them.
Before the soldiers completely give up, a wave of energy hits the whole front. It expands out of the wall and surrounds the city, causing a strong wind that wakes up the soldiers.
They used some spells to block Luciana's powers.
She can't start again because she must be tired. And, moreover, it's almost day.
The vampires retreat, using the last minutes available to climb on the walls or cross the gates. They hide from the front while the human guards get ready. They're in place, waiting for the sun rays.
It's already dawn when I decide it's better to retreat as well. Even if the sun doesn't affect me, it could give too much information to the hunters. They still don't know Julia is here.