To top off the unfortunate circumstances like rotten cherry on stale cake, the humans don't have a chain of command and a superior rank overseeing the entire defense.
Everyone is just working on their own and following their own orders. This means that even the little manpower that the humans have compared to the quantity of beasts cannot be used effectively.
If not for the fact that the inner city offered help, Legion would have quit defending the city early.
They would have quit because even if they could defend the city against this many enemies, it just wasn't worth it to reveal so much power to do so. Besides, there were benefits for them to gain by quitting.
But the nobles sent men to assist them. Each noble sent at least one person to assist them. This single person was at the epic rank at the very least.
