The following pages are an attempt to place before the reader a series of sea struggles which are unique, in that they had no precedent in naval history. If you consider all the major and minor sea fights from the earliest times to the present day; if you think of fleet actions, and single-ship contests, you cannot surpass the golden story of the Q-ships. As long as people take any interest in the untamed sea, so will these exploits live, not rivalling but surpassing the greatest deeds of even the Elizabethan seamen. During the late war their exploits were, for very necessary reasons, withheld from the knowledge of the public. The need for secrecy has long since passed, and it is high time that a complete account of these so-called ‘mystery ships’ should be published, not merely for the perpetuation of their wonderful achievements, but for the inspiration of the new race of seamen whose duty it will be to hand on the great tradition of the sea. For, be it remembered, the Q-ship service was representative of every species of seamen. There were officers and men of the Royal Navy both active and retired, of the Royal Naval Reserve, Royal Naval Volunteer Reserve, and men from the Royal Fleet Reserve. From warship, barracks, office, colony, pleasure yacht, fishing vessel, liner, sailing ship, tramp steamer, and elsewhere these seafarers went forth in unarmoured, slow-moving, lightly-armed vessels to perform the desperate adventure of acting as live-bait for a merciless enemy. It was an exploit calling for supreme bravery, combined with great fighting skill, sound seamanship, and a highly developed imagination. The successes which were attained were brought about by just this combination, so that the officers, especially the commanding officers, and the men had to be hand-picked. The slow-reasoning, hesitating type of being was useless in a Q-ship; equally out of place would have been the wild, hare-brained, dashing individual whose excess of gallantry would simply mean the loss of ship and lives. In the ideal Q-ship captain was found something of the virtues of the cleverest angler, the most patient stalker, the most enterprising big-game hunter, together with the attributes of a cool, unperturbed seaman, the imagination of a sensational novelist, and the plain horse-sense of a hard business man. In two words, the necessary endowment was brains and bravery. It was easy enough to find at least one of these in hundreds of officers, but it was difficult to find among the many volunteers a plucky fighter with a brilliant intellect. It is, of course, one of the happy results of sea training that officer or man learns to think and act quickly without doing foolish things. The handling of a ship in bad weather, or in crowded channels, or a strong tideway, or in going alongside a quay or other ship—all this practice makes a sailor of the man, makes him do the one and only right thing at the right second. But it