Passage: At 10:10, Lieutenant Commander Gerard Broadmead Roope fired five torpedoes from one mounting at a range of 800 metres (870 yd), but all missed because Captain Hellmuth Heye had kept Hipper's bow pointed at Glowworm throughout the battle to minimize his risk from torpedoes. The destroyer fell back through her smoke screen to buy time to get her second torpedo mount working, but Heye followed Glowworm through the smoke to finish her off before she could fire the rest of her torpedoes. The two ships were very close when Hipper emerged from the smoke and Roope ordered a hard turn to starboard to reduce the range and possibly ram the cruiser. Hipper was slow to answer her helm and Glowworm struck the cruiser just abaft the anchor. The collision broke off Glowworm's bow and the rest of the ship scraped along Hipper's side, gouging open several holes in the latter's hull and destroying her forward starboard torpedo mounting. One German sailor was knocked overboard by the collision. Hipper took on some 500 tonnes (490 long tons) of water before the leaks could be isolated, but was not seriously damaged. Glowworm was on fire when she drifted clear and her boilers exploded at 10:24, taking 109 of her crew with her.Admiral Hipper hove to in order to rescue her man overboard and Glowworm's survivors. The German sailor was not found, but 40 British sailors were recovered, although at least six later died of their wounds. Lieutenant Ramsay, the senior surviving officer, told his rescuers that neither the helm nor the emergency rudder were manned when the ships collided so the destroyer's turn towards Hipper was probably accidental. German accounts only mention four torpedoes fired by Glowworm, but British accounts say all ten were fired. This was confirmed by photographic evidence taken after the collision showing all of her torpedo tubes empty.Roope, who drowned when he could no longer hang on to a rope whilst being pulled up the side of the cruiser, was posthumously awarded the Victoria Cross, thus becoming the first VC...

Question: How many torpedoes were fired according to the Germans?
four