"Frida's Dilemma" - "Negotiations" [Campaign 1, Mission 4]

Question!!! How did you manage to kill anyone if they let me through the garrison first with a maximum of 5 "Paladins"? If I take a larger squad, they say: "You have too large an army, come back when you have fulfilled all the requirements..."

Maybe I'm not dividing things correctly? But after the "one-way" teleport, I can't break through anywhere further. It's impossible to kill the "Phoenixes".