As early as 1619 a small party of English Puritans had come over to Virginia; and a larger number would have followed them, but they were prevented by a royal proclamation issued at the instance of Bancroft, the persecuting Archbishop of Canterbury. In 1642 a deputation was sent from some Virginia dissenters to Boston, soliciting a supply of pastors from the New England churches; three clergymen were accordingly sent, with letters recommending them to the governor, Sir William Berkley. On their arrival in Virginia they began to preach in various parts of the country, and the people flocked eagerly to hear them. The following year the assembly passed the following act: "For the preservation of the purity of doctrine and unity of the church, it is enacted, that all ministers whatsoever, which shall reside in the colony, are to be conformable to the orders and constitutions of the Church of England and the laws therein established; and not otherwise to be admitted to teach or preach, publickly or privately; and that the governor and council do take care, that all non-conformists, upon notice of them, shall be compelled to depart the colony with all convenience."[203:A] Sir William Berkley, equally averse to the religious tenets and political principles of the Puritan preachers, issued a proclamation in consonance with this exclusive act. Mather says of the three New England missionaries: "They had little encouragement from the rulers of the place, but they had a kind entertainment with the people;" and Winthrop: "Though the State did silence the ministers, because they would not conform to the order of England, yet the people resorted to them in private houses to hear them." In a short time the preachers returned to their own country. The Indians, whose hatred to the whites, although dissembled, had never been abated, headed by Opechancanough, committed a second massacre on the 18th day of April, 1644. It was attributed to the encroachments made upon them by some of Sir John Harvey's grants; but it was suspected by some that Opechancanough was instigated to this massacre by certain of the colonists themselves, who informed him of the civil war then raging in England, and of the dissensions that disturbed the colony, and told him, that now was his time or never, to root out all of the English. This is improbable. Had the Indians followed up the first blow, the colonists must have all been cut off; but after their first treacherous onslaught, their courage failed them, and they fled many miles from the settlements. The colonists availed themselves of this opportunity to gather together, call an assembly, secure their cattle, and to devise some plan of defence and attack.