Grenades. Ceramic grenades like this one in the picture were also commonly used by the ancient Chinese armies during Sung and Ming dynasties. Basically, the ceramic grenade was a ceramic pot with several spikes on it. It was filled with gunpowder and other flammable substances. The ancient Chinese soldiers would throw the ceramic grenade towards the besieging enemies. When exploded, the ceramic shrapnel could injure the enemy soldiers in the kill zone.
Dad's Army Piggy Bank Money Pot Grenade Don't Be a Stupid Boy Limited