 In 1676, Oneco joined in the execution of Canonchet, the Narragansett commander who had led the defense of the great swamp fortress.After the Pequot leader Robin Cassacinamon shot Canonchet, Oneco beheaded him and then quartered his body.Canonchet's death at the hands of Oneco was notable as Canonchet's father, Miantonomoh, had been killed by Oneco's father, Uncas, in 1643.