On May 15th the Austrians made a cruiser raid on the drifter line. At 3 a.m. (Central European time), an hour before daylight, two four-funnelled Austrian cruisers suddenly crossed the drifter line from north to south. Seven divisions, each consisting of seven drifters, lay, with nets out, across the southern end of the Straits offering an easy target for attack. Having surveyed the trend and extent of the line the cruisers began their operations about 4 a.m. One attacked from the western end of the line, a second from the eastern end, and it is believed that a third attacked at the centre of the line. There was no occasion for haste and the cruisers stopped their engines to fire, even taking prisoners at the eastern end from the drifters. About 4.45 a.m. the raiders ceased firing and returned to Cattaro.
In a contest between small drifters, each with one tiny gun, and fast cruisers, armed with much superior batteries, the odds were of course ludicrously unequal. That did not deter the British fishermen from fighting. Several of the drifters, in the most gallant manner, engaged the big cruisers, and what is more, obtained some hits. In spite of this gallantry, no fewer than fourteen drifters were sunk and the losses of personnel were heavy, eight officers being taken prisoners to Austria.
In the 1918 book, Daring Deeds of Merchant Seamen in the Great War, Harold F B Wheeler described the action at Otranto.
The Davids of the Patrol, together with some thirty consorts, had the temerity to fight three Austrian light cruisers and their attendant destroyers. Each was armed with a single gun of small calibre, and carried a crew of ten. The men must have had extraordinary faith in their weapon. It was about as useful for the purpose as a pea-shooter would be for dispatching elephants.
— Harold F B Wheeler, Daring Deeds of Merchant Seamen in the Great War
One of the captains gave the men of the drifters an opportunity to take to the boats before he opened fire. He adopted no cold-blooded submarine tactics. First of all he signalled by flag and syren that the crews were to abandon their vessels. As there were no signs that his order was being carried out, he approached to within 100 yards of the Gowan Lea and repeated his instructions by megaphone. Skipper Joseph Watt neither intended to stop nor clear out, though he must have appreciated the sportsmanlike behaviour of his enemy. Watt addressed his reply to his own crew. Surrender? He would burst first! He bade his men 'fight to a finish', slipped his nets, rang down to the engine-room for full speed ahead, and called for three cheers.
The crew shouted as though the reputation of the British Navy depended on their response, manned their solitary gun, and opened fire. These were supremely brave things to do. The crew of the Gowan Lea shot with excellent precision too, keeping hard at it until a shell from the enemy put their puny weapon out of action. The blowing-up of a box of ammunition did not tend to ease matters. The explosion badly wounded Deckhand F. H. Lamb, but failed seriously to impair his usefulness. Though still subjected to a heavy fire, he went on helping to repair the damage to the gun. Lamb's pluck and coolness earned for him the Conspicuous Gallantry Medal.
Skipper Dennis John Nichols, though wounded in three places, remained steering his vessel in the wheel-house, and when Lieutenant G. R. Barling was killed, took command of the late officer's division. Despite his hurts Nichols launched a boat, from which he managed to plug the holes made in the side of the drifter during the action. They were only rough-and-ready repairs, carried out in the minimum of time and without technical finish, but they held until the Floandi reached port. He had saved his ship.
Skipper William Bruce and his men of the Quarry Knowe remained at their posts until the vessel blew up. Skipper Robert Stephen, of the Tails, stuck to her while she was sinking under him, as did the crews of the Girl Rose and the Selby. Finding that one of their number was missing, the men of the Tails returned through heavy fire to search for him. Skipper William Farquhar, together with his company, remained on the Admirable until there was precious little of her to remain on. The boiler had blown up, and the wheel-house was smashed. After they had taken to the boat, A. Gordon, the second hand, went back. It is believed that his intention was to fight the gun. Before he could reach it he was killed.
Skipper Robert Cowe kept the Coral Haven heading for the enemy and his gun firing until the ship was a raging furnace and beyond control. The first Victoria Cross ever awarded to the master of a drifter was bestowed on Joseph Watt; the other skippers mentioned each received the Distinguished Service Cross. Never were there more worthy recipients.
Second Hand Joseph Hendry, of the Serene, refused to abandon his ship. The others left her and were captured. When she sank under him, he managed to keep his head above water, and was eventually rescued. Today he wears the Conspicuous Gallantry Medal. Engineman Walter Watt was taken prisoner with the remainder of the crew of his drifter. While being conducted to one of the cruisers he jumped overboard. He was recaptured, but eluded the vigilance of the guard when alongside the man-of-war. Once again Watt plunged into the sea. This time he escaped. Result — C.G.M.
Throughout the fight it was evident that the Austrian gunners were resolutely determined to prevent appeals for help from being sent. Their first attentions were directed against the drifters fitted with the necessary apparatus, one in each division. Operators Wadsworth and Yarwood, of the Capella and Garrigill respectively, remained on duty throughout the action, while the Marconi man of the tough little Floandi unfortunately paid for his devotion with his life.
This log was found in this condition in the wireless operating cabin of H.M. drifter Floandi, after an attack on the drifter line by three Austrian cruisers in the Adriatic on May 15, 1917. The wireless operator, Douglas Morris Harris, A.B., R.N.V.R., continued to send and receive messages although the drifter was being riddled by shells until he was killed by a piece of shrapnel whilst writing in the log. The piece of shell perforated the log, and the line made by his pencil when he was hit and collapsed can be seen on the page upon which he was writing. The operator was found dead in his chair lying over the log.
— Rear-Admiral commanding British Naval forces in the Adriatic
Without the slightest concern for the shells that were passing between the mast and the funnel, Second Hand John Turner clambered aloft to strike the topmast so that the aerials should not be destroyed. For displaying such great coolness under fire Turner was awarded the C.G.M.
When the cruisers attacked, Garrigill (equipped with Wireless/Telegraphy and armed with a 6-pounder gun in the bow) was in C Division. In The Battle of the Otranto Straits Paul G Halpern describes what happened. C Division also reported being under fire from two cruisers, obviously the Helgoland and Saida. Linienschiffskapitän Purschka, commanding the Saida, had the least distance to steam after the cruisers separated and apparently was the first of the cruiser commanders to spot the drifters, detecting several at 0345. In order to avoid premature disclosure, the Saida stopped engines and remained motionless for about half an hour before Purschka commenced his attack at 0420. The first drifter taken under fire was quickly set ablaze although her crew fired back bravely with their small gun before being compelled to abandon ship.
The drifter Garrigill of C Division, armed with a 6-pounder, was especially cited in reports of the action for being one of the first attacked and immediately returning enemy fire with all members of the crew behaving "in a highly creditable manner".
After the raid, the surviving drifters were ordered to assemble at Fano Island. Here they were re-organised and given orders for patrol. Fourteen drifters had been sunk, three seriously damaged and one less severely damaged. Seventy-two men were taken prisoner. Only about nine were killed.