bomb did not detonate. The second, a bomb, exploded causing superficial damage. Six aircraft were shot down in the attack. Goodwood IV followed on 29 August, with 34 bombers and 25 fighters from Formidable and Indefatigable. Heavy fog prevented any hits from being scored. Tirpitzs gunners shot down one Firefly and a Corsair. The battleship expended 54 rounds from her main guns, 161 from the 15 cm guns and up to 20 percent of her light anti-aircraft ammunition. Operations Paravane and Obviate The ineffectiveness of the great majority of the strikes launched by the Fleet Air Arm in mid-1944 led to the task of Tirpitzs destruction being transferred to the RAF's No. 5 Group. The RAF used Lancaster bombers to carry Tallboy bombs to penetrate the ship's heavy armour. The first attack, Operation Paravane, took place on 15 September 1944; operating from a forward base at Yagodnik in Russia, 23 Lancasters (17 each carrying one Tallboy and six each carrying twelve JW mines), scored a single hit on the ship's bow. The Tallboy penetrated the ship, exited the keel, and exploded in the bottom of the fjord. The bow was flooded with of water, causing a serious increase in trim forward. The ship was rendered unseaworthy and was limited to . Concussive shock caused severe damage to fire-control equipment. The damage persuaded the naval command to repair the ship for use only as a floating gun battery. Repair work was estimated to take nine months, but patching of the holes could be effected within a few weeks, allowing Tirpitz to be moved further south to Tromsø. On 15 October, the ship made the trip to Tromsø under her own power, the last voyage of her career. The RAF made a second attempt on 29 October, after the ship was moored off Håkøya Island outside Tromsø. Thirty-two Lancasters attacked the ship with Tallboys during Operation Obviate. As on Operation Paravane, No. 9 Squadron and No. 617 Squadron carried out the attack together, which resulted in only one near miss, partially the result of bad weather over the target. The underwater explosion damaged the port rudder and shaft and caused some flooding. Tirpitzs 38 cm fragmentation shells proved ineffective in countering the high-level bombers; one aircraft was damaged by ground-based anti-aircraft guns. Following the attack, the ship's anchorage was significantly improved. A large sandbank was constructed under and around the ship to