This unsatisfactory business caused great irritation among the colonists. The heavy expense of carrying on the negotiations in England "made them desperately uneasie, especially when, after a whole Year's Patience ... they had no Encouragement from their Agents".[415] A tax of fifty pounds of tobacco per poll, imposed for the purchase of the Northern Neck, aroused widespread dissatisfaction. In April, 1676, Governor Berkeley, fully conscious of the mutterings of revolution, was awaiting with anxiety the arrival of favorable news from the agents. "There are divers," he wrote, "that would fain persuade the people that al their high taxes will bring them no benefit, so that if the most advantageous terms had been proposed to us it would have been impossible to have persuaded the people to have parted with more tobacco til a more certain demonstration had been given them of what is already done. I appeased two mutinies this last year raysed by some secret villaines that whispered amongst the people that there was nothing intended by the fifty pounds levy but the enriching of some few people."[416] In 1677, after Bacon's Rebellion, the King's commissioners heard from all sides that the imposition of this tax was one of the main causes of discontent.[417] The wars of 1664 and 1672 with Holland added much to the distress in Virginia. The bold Dutch mariners, angered at the injury done them by the Navigation Acts, preyed upon the English merchantmen in every sea. Woe to the tobacco ship that encountered a hostile privateer, in its journey across the Atlantic! The English vessels were not safe even in the Virginia rivers, under the guns of their forts. Twice the daring Dutch came through the capes and into the James River itself, where they wrought great damage to the shipping. It was the custom, during these times of danger, for the merchant vessels of Virginia and Maryland to cross the Atlantic in large fleets, under the protection of English men-of-war. In May 1667, some twenty vessels were anchored in the mouth of James River, near Newport News, awaiting the remainder of their fleet before sailing. Three leagues above them lay the _Elizabeth_, a frigate of forty-six guns, sent by the King for the protection of the colony. She was undergoing repairs, however, having become "soe disabled in her Maste and Leaky in her Hull as that she could not keep at sea", and for the moment afforded little proctection to the merchantmen riding below.[418]