A Horizon Book on Vikings claims that some chieftains would hold their berserkers in reserve during a battle. Once a portion of the enemy line appeared to tire or weaken, the chieftains would send the berserkers charging into the enemy ranks to hopefully open a break and even panic the enemy. The book also claimed that while on sea voyages close to land, berserkers were sometimes asked to go ashore to find objects on land to wrestle or bash to give vent to their fury.