A deadly feud was raging among the boys of Numedale. The East-Siders hated the West-Siders, and thrashed them when they got a chance; and the West-Siders, when fortune favored them, returned the compliment with interest. It required considerable courage for a boy to venture, unattended by comrades, into the territory of the enemy; and no one took the risk unless dire necessity compelled him.