In 1610, at the age of 24, Mainwaring was given a commission from
Lord High Admiral Nottingham to capture the notorious
Newfoundland "arch-pirate"
Peter Easton, then feared to be hovering around the
Bristol Channel. This may have been just a convenient excuse for the well-armed
Resistance, his small but speedy ship, to become a scourge to the Spanish. On reaching the
Straits of
Gibraltar, Mainwaring announced to his crew his intention of fighting the Spanish anywhere he found them. Turning to piracy was not that out of line for the young valiant in those years. In 1614 he sailed his fleet to Newfoundland, saying that the region was the best in which to recruit a pirate crew and reprovision his ships. Mainwaring used Easton's old base at
Harbour Grace,
Canada, as his pirate base and raided
Spanish,
Portuguese, and
French ships. On 4 June 1614, off the coast of Newfoundland, Mainwaring, in command of eight vessels, plundered the
cod-fishing fleet, stealing provisions and taking away with him carpenters and mariners. In taking seamen, Mainwaring would pick one out of every six. In all, 400 men joined him willingly, while others were
perforstmen. Sailing to the coast of Spain, Mainwaring then took a Portuguese ship and plundered her cargo of wine, and he later took a French prize and stole 10,000 dried fish from her hold. When Mainwaring was away from his main base at
La Mamora, on the Atlantic coast of present-day
Morocco, a Spanish fleet under Admiral
Luis Fajardo, sailing from
Cádiz on 1 August 1614, conquered the town. Mainwaring's relations with the
Moors were such that he was able to secure the release of their English prisoners. So feared was his pirate fleet that Spain offered Mainwaring a pardon and high command in return for his services under the Spanish flag. Such actions earned Mainwaring a reputation as a formidable seaman. According to the
Venetian ambassador,
Piero Contarini:He was unsurpassed in nautical skill for fighting his ship, for his mode of boarding and resisting the enemy...For nautical experience and for sea-fights, and for a multitude of daring feats performed afloat, he is in high repute, being considered resolute and courageous and perfectly suited to that profession, understanding the managing of
first-rates better perhaps than anyone. == Pardon and service in the Royal Navy ==