Next day we had another similar cruise, during which we visited the beautiful Sound called New Grimsby.  On one side stands the tower, known as Cromwell's Castle--not that he was ever in the island, but he ordered it to be built.  On the opposite side are the ruins of another fort.  It was here that the forces under Blake and Askew landed, and attacked the fortifications, though they met with a stout resistance from the Royalists, who at length took to flight.