"Wherefore their intent and purpose was, that the Duke of Parma, in his small and flat-bottomed ships, should, as it were under the shadow and wings of the Spanish fleet, convey ouer all his troupes, armor, and war-like provisions, and with their forces so united, should invade England; or while the English fleet were busied in fight against the Spanish, should enter upon any part of the coast, which he thought to be most convenient. Which invasion--as the captives afterward confessed--the Duke of Parma thought first to have attempted by the river of Thames; upon the bankes whereof having at the first arrivall landed twenty or thirty thousand of his principall souldiers, he supposed that he might easily have wonne the citie of London; both because his small shippes should have followed and assisted his land forces and also for that the citie it-selfe was but meanely fortified and easie to ouercome, by reason of the citizens' delicacie and discontinuance from the warres, who, with continuall and constant labor, might be vanquished, if they yielded not at the first assault."[4] [4] Hakluyt: _Voyages_. But the English and Dutch found ships and mariners enough to keep the armada itself in check, and at the same time to block up Parma's flotilla. The greater part of Seymour's squadron left its cruising-ground off Dunkirk to join the English admiral off Calais; but the Dutch manned about five-and-thirty sail of good ships, with a strong force of soldiers on board, all well seasoned to the sea-service, and with these they blockaded the Flemish ports that were in Parma's power. Still it was resolved by the Spanish admiral and the Prince to endeavor to effect a junction, which the English seamen were equally resolute to prevent; and bolder measures on our side now became necessary. The armada lay off Calais, with its largest ships ranged outside, "like strong castles fearing no assault, the lesser placed in the middle ward." The English admiral could not attack them in their position without great disadvantage, but on the night of the 29th he sent eight fire-ships among them, with almost equal effect to that of the fire-ships which the Greeks so often employed against the Turkish fleets in their war of independence. The Spaniards cut their cables and put to sea in confusion. One of the largest galeases ran foul of another vessel and was stranded. The rest of the fleet was scattered about on the Flemish coast, and when the morning broke it was with difficulty and delay that they obeyed their admiral's signal to range themselves round him near Gravelines. Now was the golden opportunity for the English to assail them, and prevent them from ever letting loose Palma's flotilla against England, and nobly was that opportunity used.