http://www.kbismarck.com/bismarck-chase.html
The Bismarck is Located.
In the morning of 26 May, as the Bismarck was approaching the French coast, the crew was ordered to repaint the top of the main and secondary turrets yellow. Hard job considering the state of the seas, nevertheless it was carried out although the yellow paint washed off at least once.
A few hours earlier, at 0300, two Coastal Command Catalina flying boats had taken off from Lough Erne in Northern Ireland on a reconnaissance mission in search for the Bismarck. At about 1010, Catalina Z of 209 Squadron commanded by Dennis Briggs sighted the German battleship that immediately answered with very accurate anti-aircraft fire.2 The Catalina jettisoned her four depth charges and took evasive action after her hull was holed by shrapnel. Then reported: “One battleship, bearing 240º, distance 5 miles, course 150º. My position 49º 33’ North, 21º 47’ West. Time of transmission 1030/26.” After more than 31 hours since the contact was broken, the Bismarck had been located again. Unfortunately for the British, however, Admiral Tovey’s ships were too far away from the German battleship. The King George V was 135 miles to the north, and the Rodney (with a top speed of 21 knots) was 125 miles to the northeast. They would never catch up with the Bismarck unless her speed could be seriously reduced.
Only the Force H, under the command of Vice-Admiral Sir James F. Somerville, sailing from Gibraltar, had a chance to intercept Bismarck. The battlecruiser Renown (Captain Rhoderick R. McGriggor) was in the best position, but having lost the Hood only two days earlier, the Admiralty did not permit Renown to engage the Bismarck. The best hope for the British was to launch an air strike from the carrier Ark Royal. The Ark Royal had already launched 10 Swordfish at 0835 to try find the Bismarck, and once the report of the Catalina sighting arrived, the two closest Swordfish altered course to intercept. At 1114, Swordfish 2H located the German battleship too, followed seven minutes later by the 2F. Shortly afterwards two more Swordfish, fitted with long-range tanks, were launched to relieve 2H and 2F and keep touch with Bismarck.
At 1450, fifteen Swordfish commanded by Lieutenant-Commander J. A. Stewart-Moore took off from the Ark Royal (Captain Loben E. Maund) to attack the Bismarck. At 1550, they obtained radar contact with a ship and dived to attack. The attack, however, turned out to be a failure since the ship sighted was actually the light cruiser Sheffield (Captain Charles A. Larcom) which had been detached from Force H to make contact with the Bismarck. Luckily for the British, the Sheffield was not hit by any of the 11 torpedoes launched because they had faulty magnetic pistols. Two torpedoes exploded upon hitting the water, three on crossing the cruiser wake, and the other six were successfully avoided. The Swordfish returned to the Ark Royal where they landed after 1700, but not without trouble because of the terrible weather conditions. The rise and fall of the stern was measured to be 56 feet, and three aircraft smashed their undercarriages against the flight deck. Shortly afterwards, at 1740, the Sheffield obtained visual contact with the Bismarck.
The British put every effort on one last attack. It would be dark soon, and they knew this was their last real chance to stop or at least slow down the Bismarck. If they failed again, the Bismarck would reach the French coast on the next day, since another air strike late at night was unlikely to succeed. Therefore, at 1915, another group comprised of fifteen Swordfish, mostly the same used in the previous attack, took off from the Ark Royal, and this time their torpedoes were armed with contact pistols.
Meanwhile, the pursuing British forces had run across U-556 (Lieutenant Herbert Wohlfarth) which sighted the Renown and the Ark Royal at 1948. The German submarine was perfectly placed for an attack, but could not do so as it had no torpedoes left. Wohlfarth had spent his last “fishes” on the ships of convoy HX-126 a few days back. Therefore, U-556 could only make signals reporting the position, course and speed of the enemy.
The Swordfish striking force, this time under the command of Lieutenant-Commander T.P. Coode, first approached the Sheffield to get the range and bearing to the Bismarck, and at 2047, began the attack. Bismarck’s anti-aircraft battery opened fire immediately. During the course of the attack, the Bismarck received at least two torpedo hits. One torpedo (or two) hit the port side amidships, and another struck the stern in the starboard side. The first hit did not cause important damage, but the second jammed both rudders at 12º to port. The Bismarck made a circle and then began to steer northwest involuntarily into the wind. As before, none of the Swordfish were shot down although some were hit several times. The damage to the Bismarck was so serious that at 2140, Admiral Lütjens sent the following message to Group West: “Ship unable to manoeuvre. We will fight to the last shell. Long live the Führer”.
The impact in the stern area caused the flooding of the steering and other adjacent compartments. This meant that all repair attempts would have to be done under water. Divers were ordered to enter the steering compartment in order to free the rudders, but the violent movement of the water inside made this an impossible task. It was not possible to lower divers over the side due to the high seas. As an alternative, it was considered to blow the rudders away with explosives and try to steer the ship using the propellers alone, but the idea was rejected fearing that the explosion could damage the propellers.
Destroyers Attack Bismarck.
After the aerial torpedo attack, the new erratic course of the Bismarck caused her to close the range with the Sheffield. At about 2145, Bismarck opened fire on the Sheffield at a range of about nine miles. Bismarck fired a total of six salvoes and the British cruiser turned away to the north under the cover of a smoke screen. The Sheffield was not hit, but some splinters disabled her radar and injured twelve men of whom three died later.3 The turn caused Sheffield to lose contact with Bismarck, but at 2200, she made contact with the destroyers of the 4th Flotilla (Captain Philip L. Vian) Cossack, Maori, Zulu, Sikh and Piorun, and provided them with the approximate bearing and distance to the German battleship.
At 2238, the Polish destroyer Piorun (Commander Eugeniusz Plawski) sighted the Bismarck. The German battleship responded shortly thereafter with three salvoes. The destroyers proceeded to attack, but Bismarck defended herself vigorously in the dark. At 2342, splinters knocked down Cossack’s antennas.
Let's just call that a practice run.
But wait a minute - If the Swordfish pilots hadn't exerienced this incredible snafu would they not have had the same results when they really did attack Bismarck? Which would have left Bismarck steaming straight for France and safety as night fell?