At least on one point, Charles listened to Fox. The 700 Quakers who had been imprisoned under Richard Cromwell were released, though the government remained uncertain about the group's links with other, more violent, movements. A revolt by the Fifth Monarchists in January 1661 led to the suppression of that sect and the repression of other Nonconformists, including Quakers.Fox in Nickalls, pp. 394–395, and Jones, chapter 14. In the aftermath of this attempted coup, Fox and eleven other Quakers issued a broadside proclaiming what became known among Friends in the 20th century as the "peace testimony", committing themselves to oppose all outward wars and strife as contrary to the will of God. Not all his followers accepted this commitment; Isaac Penington, for example, dissented for a time, arguing that the state had a duty to protect the innocent from evil, if necessary by using military force. Despite the testimony, persecution against Quakers and other dissenters continued.
