What is a spiked ball on a chain?

A spiked ball on a chain, often referred to as a "flail," is a medieval weapon consisting of a heavy ball with spikes attached to a handle by a chain. This design allows for powerful swinging strikes, making it effective for both offense and defense in close combat. The weapon's mobility can also make it difficult for opponents to predict its trajectory, increasing its lethality. Historically, flails were used by foot soldiers and in some cases, by mounted knights.