Unicorn Empire

Hello, could you please offer some advice on the following issue: I can't complete the 4th mission where I need to capture the city of Aiven. I defeat the enemy in the city, but after the victory, the city is still not captured, and the enemy is still there, but with a smaller army. What should I do?

The 4th mission is very buggy. I even experienced a freeze when capturing the garrison near Aiven (the console said there was no hero - Andrias on the map). In short, fight again, and after the battle, take a screenshot of the console and post it here. This is clearly a problem with the map's scripts.