This is the first time Leo's army went south so they met a lot of obstacles from zombies and monsters that got attracted towards them because of how how loud their movements are but it was mostly due to the Three Black Hawks attracting them.
The amount of zombies and mutated beast attacking them didn't really surprise Leo as there really aren't any force around to clean them up except for Leo's group because they only focus on clearing their northern and easter sides and a bit in the western side but the South of them was left untouch, resulting into a nest of monsters and zombies.
"Don't waste your bullets and use your melee weapons instead if you can" Leo standing on top of the tallest house in the village said through the intercom while also yelling at the same as he hacked a Hunter Zombie into two halves.