I mean a horse is certainly bigger than anything I have had to kill, I will give you that.
But I went with spear because it’s typically the weapon of choice against cavalry, it gives you distance reducing the chance you get kicked. You can also place multiple spears around you to protect your location, or make traps and scare it into running into them.
Fortunately I won’t have to, because I live in the UK. But if that the nazis come here I have some queer friends that I will join for a molotov party.