Troubles between the Indians and the whites arose so early as 1636. John Oldham was murdered on Block Island by a party of Pequot Indians. Vane of Massachusetts sent Endicott to inflict punishment. The Pequots in turn attacked the fort at Saybrook, and in 1637 threatened Wethersfield. They were planning a union with the Narragansets for the destruction of the English, when Roger Williams informed the Massachusetts colony of their designs and, at the urgent request of the governor and council, hastened to the chief of the Narragansets and dissuaded him from entering into the alliance. The moment was critical. Captain Mason with about ninety English and seventy Mohegans, under their sachem, Uncas (a sub chief, who with his district, Mohegan, had rebelled against the Pequot sachem, Sassacus), was sent from Hartford down the Connecticut River. Entering the Sound, he sailed past the mouth of the Thames and anchored in Narragansett Bay, at the foot of Tower Hill, near Point Judith. He knew that keen-eyed scouts from the Pequot stronghold on the west bank of the Mystic River, near Groton, had, as his three little ships skirted the shore, been watching him, to give warning of his approach. He therefore resolved to come upon the enemy from an unlooked-for quarter. This plan was directly contrary to his instructions, which required him to land at the mouth of the Thames and attack the fort from the west side. He hoped, marching westward across the country, to take the enemy by surprise on their unprotected rear, while the Indians, trusting in the strength of their fort, as it fronted the west, should believe themselves secure. [Illustration: Attack on the Fort of the Pequots on the Mystic River "The figure of the Indians fort or Palizado in NEW ENGLAND And the maner of the destroying It by Captayne Underhill and Captayne Manson"]