This fleet was the strangest phenomenon in naval history. It was half Dutch, half English, with a flavour of Huguenot, and was commanded by a Flemish noble, Count de la Mark. Its head-quarters were in the Downs or Dover Roads, where it could watch the narrow seas, and seize every Spanish ship that passed which was not too strong to be meddled with. The cargoes taken were openly sold in Dover market. If the Spanish ambassador is to be believed in a complaint which he addressed to Cecil, Spanish gentlemen taken prisoners were set up to public auction there for the ransom which they would fetch, and were disposed of for one hundred pounds each. If Alva sent cruisers from Antwerp to burn them out, they retreated under the guns of Dover Castle. Roving squadrons of them flew down to the Spanish coasts, pillaged churches, carried off church plate, and the captains drank success to piracy at their banquets out of chalices. The Spanish merchants at last estimated the property destroyed at three million ducats, and they said that if their flag could no longer protect them, they must decline to make further contracts for the supply of the Netherlands army.
It was life or death to Elizabeth. The Ridolfi plot, an elaborate and far-reaching conspiracy to give her crown to Mary Stuart and to make away with heresy, was all but complete. The Pope and Philip had approved; Alva was to invade; the Duke of Norfolk was to head an insurrection in the Eastern Counties. Never had she been in greater danger. Elizabeth was herself to be murdered. The intention was known, but the particulars of the conspiracy had been kept so secret that she had not evidence enough to take measures to protect herself. The privateers at Dover were a sort of protection; they would at least make Alva's crossing more difficult; but the most pressing exigency was the discovery of the details of the treason. Nothing was to be gained by concession; the only salvation was in daring.
At Antwerp there was a certain Doctor Story, maintained by Alva there to keep a watch on English heretics. Story had been a persecutor under Mary, and had defended heretic burning in Elizabeth's first Parliament. He had refused the oath of allegiance, had left the country, and had taken to treason. Cecil wanted evidence, and this man he knew could give it. A pretended informer brought Story word that there was an English vessel in the Scheldt which he would find worth examining. Story was tempted on board. The hatches were closed over him. He was delivered two days after at the Tower, when his secrets were squeezed out of him by the rack and he was then hanged.