On 22 June 1917 Lieutenant-Commander William Sanders was awarded the Victoria Cross. The citation, available on Naval-History.net, said merely that Sanders ‘had been decorated because of his conspicuous gallantry, consummate coolness, and skill in command of one of H.M. ships in action.’ The reason for the vagueness was that Sanders was one of a number of sailors awarded the VC in 1917 for actions involving Q-ships, apparently innocuous merchant ships that were manned by the RN and given heavy but concealed armaments. First World War submarines carried relatively few torpedoes (12 in the newest German boats and six or eight in older ones), so often surfaced to sink smaller targets with gunfire.
William Sanders was a thirty-four year old New Zealander who has been a merchant seaman before the war. He had already been awarded a Distinguished Service Order for unspecified reasons whilst serving in a Q-ship. In early 1917 he was given command of HMS Prize, a Q-ship that had originally been a German ship called Else and was the first enemy ship to be captured by the British in the war.
Prize, a 227 ton schooner, was armed with two 12 pounder guns [76.2mm} and a Lewis machine gun. At 8:35 pm on 30 April 1917 she spotted a surfaced submarine two miles away. She was U93 (Kapitänleutnant Edgar Freiherr von Spiegel von und zu Peckelsheim) and was on her maiden voyage.
Speigel had previously commanded U32 and wrote a book called Kriegstagebuch U 202 based on his experiences: there was no U202 in WWI. It was translated into English after the war under the title War Diary of U202.
By 28 April U93 had sunk three sailing ships and a steamer, totalling 5189 tons. One of the sailing ship was Danish and the other two plus the steamer Norwegian. The largest sailing ship was torpedoed after being stopped, with the others being sunk by gunfire. That day she damaged the 207 ton Danish sailing ship Diana, which was towed into Queenstown: see U-Boat.net.
On the evening of 29 April U93 torpedoed the defensively armed steamer Comedian (4,889 tons) and then the Ikbal (5,434 tons), both British and carrying ammunition. Both were first torpedoed and then finished off by gunfire. In the early hours of 30 April U93 torpedoed and sank the defensively armed British steamer Horsa (2,949 tons). She picked up survivors from both Ikbal and Horsa, who reported that their treatment ‘left nothing to be desired.’
At 6:30 am U93 was in sight of the Russian sailing ship Borrowdale (1,268 tons) and two defensively armed steamers: the Italian Ascaro (3,245 tons) and the British Huntsmoor (4,957 tons). She torpedoed and sank the Ascaro at 7:05 am. Five minutes later the Huntsmoor opened fire. She then sighted U21 and HMS Begonia (Q10) headed to her. Begonia was a fleet minesweeping sloop that had been modified to look like a merchantman rather than a secretly armed merchantman.
At 09:00 am U21 sank the Borrowdale by gunfire. U93 surfaced and transferred her prisoners to the Borrowdale’s boats. At 09:40 am U93 opened fire on Begonia, which replied, forcing U21 to dive. U93 remained on the surface until Begonia had reduced the range to 1.5 miles, when she dived and escaped. At 5:30 pm the same day U93 torpedoed and sank without warning the Greek steamer Parthenon (2,934 tons): see U-boat.net for a list of the ships sunk by U93.
U93 by now had only two torpedoes left. Three hours after sinking the Parthenon, she encountered what appeared to him to be an innocuous sailing ship but was actually HMS Prize. Following his normal tactics of surfacing to attack small ships with gunfire and torpedoing large ones whilst submerged, Spiegel opened gunfire on the sailing ship at 08:45 pm. Some of its crew apparently panicked and abandoned ship.
U93 scored several hits on her, wrecking her radio room and one of her two engines, and had closed to 80 yards range by 9:05 pm when Sanders raised the white ensign and ordered his concealed guns to open fire. Spiegel tried to ram but U93 was too close to Prize to do so. The British quickly hit the U93′s conning tower and forward gun. Spiegel and two other Germans ended up in the water. U93 withdrew to 600 yards range. Prize could not close the range because her second engine had given out, but U93 disappeared and appeared to have sunk.
Prize picked up Speigel, Warrant Officer Wilhelm Knappe and Petty Officer Walter Deppe. She was very badly damaged but managed to reach Kinsale on 2 May. Three of her crew were wounded. Sanders was awarded the VC and promoted to Lieutenant-Commander. Lieutenant W. D. Beaton received the DSO.
U93 had not sunk. After her forward gun was put out action her executive officer Oberleutnant Wilhelm Ziegner ordered her to zigzag. Hits to her fuel and diving tanks meant that she was listing 14 degrees to starboard, but she was able to get out of range. As well as the three men who went overboard, several were wounded and one died during the night.
U93 had been hit at least nine times, her guns, periscope and wireless masts were out of action and there was damage to he fuel and diving tanks and several valves and compressed air tanks. A hole in the pressure hull meant that she could not dive, although it was above the waterline when surfaced. She had only just enough oil to get home, with no reserve for high speed dashes if she met Allied warships.
Ziegner managed to get her round Shetland, narrowly avoiding British patrols. U93 met a German trawler near Sylt Island and was towed into Wilhelmshaven after running out of fuel. She was cheered by all the ships she passed and Admiral Reinhard Scheer, C.-in-C. of the High Seas Fleet went on board to congratulate her crew.
Prize was lost with all hands, including Sanders, on 14 August. She encountered UB48 whilst operating with the British submarine D6. The idea was that Prize would attract a U-boat and then signal its position to D6 which would torpedo the German vessel. Sanders, however, opened fire on UB48, which dived and escaped. Now knowing that Prize was a Q-ship, UB48 returned and torpedoed her without surfacing.
Spiegel wrote more books after the war and served in the German diplomatic service in WWII: see Wikipedia. He died in 1965. Ziegner captained UC87 in 1918 but died in December 1919: see U-boat.net.
 R. Gray, Conway’s All the World’s Fighting Ships, 1906-1921 (London: Conway Maritime Press, 1985), pp. 175-78.
 T. Bridgland, Sea Killers in Disguise: The Story of the Q Ships and Decoy Ships in the First World War (London: Leo Cooper, 1999), p. 83.
 Naval Staff Monograph (Historical) 1933 vol. xviii, Home Waters part viii, December 1916 to April 1917, pp. 424-26.
 Ibid. pp. 424-5 says Diana was sunk.
 Ibid., p. 425.
 Ibid., pp. 425-26.
 Friedrich Ruge, The Submarine War: a U-Boat commanders view in B. Fitzsimons, Warships & Sea Battles of World War I (London: Phoebus, 1973), p. 140.
 Naval Staff vol. Xviii, pp. 426-27.
 Ruge in Fitzsimons, Warships, p. 141.
 Bridgland, Sea Killers, pp. 117-18; R. H. Gibson, M. Prendergast, The German Submarine War, 1914-1918 (London: Constable, 1931), p. 170.