Sylvie's first task upon returning to Winterfell City was to install four magic cannons on the city walls, one for each wall.

Why only four?

This was because Carl Bloodhoof had pleaded desperately, even offering his own beef as leverage, and shamelessly managed to keep one magic cannon and two boxes of magic crystals for himself.

He was no longer just a Minotaur Warrior of the Bloodhoof Clan; he was now a brand new unit type—a Minotaur Magic Cannon Soldier!