[Porsche-O-Phile]

Cannonballs explode?

News to me. I always thought they were just projectiles - big heavy chunks of metal that were lobbed at enemy positions at high velocity because of expanding gas (being shot out of a cannon). I never realized they were themselves fragmentation weapons. Were they?

All the ones I've seen in museums just look like big spherical chunks of metal. No fuses or obvious places where an explosive charge would go. And how would it detonate anyway?