A true and certain relation of the strange discovery and sudden apprehending of the three grand traytors, Colonel Okey, Colonel Barkstead, and Mil[e]s Corbert on Sunday night last, at Delft in Holland; [electronic resource] : by Sir George Downing, Major Miles and several other English gentlemen. The demands of Sir George Downing to the States of Holland, in the name of His Majesty the King of Great Brittain: the order granted thereupon; and the securing the traytors aboard the Blackamore frigot, and landing them at Harwich in Essex, having a strong guard to convey them to the Tower of London: with their several speeches when they were surprized; and the strange workings and purgings of Miles Corbet upwards and downwards.