The Dutch invasion was the third great calamity which signalized King Charles's unfortunate reign. The ships of the enemy came up the Thames and the Medway, which is a branch of the Thames; they took possession of a fort at Sheerness, near the mouth of the river, and, after seizing all the military stores, which had been collected there to an enormous amount, they set fire to the powder magazine, and blew up the whole fortress with a terrific explosion. The way was now open to them to London, unless the English could contrive some way to arrest their progress. They attempted to do this by sinking some ships in the river, and drawing a strong chain across from one sunken vessel to the other, and fastening the ends to the shores. The Dutch, however, broke through this obstruction. They seized an opportunity when the tide was setting strongly up the river, and a fresh wind was blowing; their ships, impelled thus by a double force, broke through the chains, passed safely between the sunken ships, and came on in triumph up the river, throwing the city of London into universal consternation. There were several English ships of war, and several Dutch ships, which had been captured and brought up the Thames as prizes, lying in the river; these vessels were all seized by the Dutch, and burned; one of the English ships which they thus destroyed was called the Royal Oak. Of course, there was now a universal scene of confusion and terror in London. Every body laid the blame of the calamity upon the king; the money which he had received for building ships, and other national defenses, he had squandered, they said, upon his guilty pleasures; then the war, which had resulted in this invasion, was caused by the political mismanagement of his reign. While the people, however, thus loudly condemned the conduct of their monarch, they went energetically at work to arrest the progress of their invaders; they sunk other ships in greater numbers, and built platforms, on which they raised batteries of cannon. At length the further progress of the enemy was stopped, and the ships were finally compelled to retire.