Editing Invincible-class battlecruiser (section)

====Battle of Dogger Bank====
{{Main|Battle of Dogger Bank (1915)}}
On 23 January 1915, a force of German battlecruisers under the command of Admiral [[Franz von Hipper]] sortied to clear the [[Dogger Bank]] of any British fishing boats or small craft that might be there to collect intelligence on German movements. But the British were reading their coded messages and sailed to intercept them with a larger force of British battlecruisers under the command of Admiral Beatty, which included ''Indomitable''. Contact was initiated at 07:20 on the 24th when the British light cruiser ''Arethusa'' spotted the German light cruiser {{SMS|Kolberg}}. By 07:35 the Germans had spotted Beatty's force and Hipper ordered a turn to the south at {{convert|20|kn}}, believing that this would suffice if the ships that he saw to his northwest were British battleships and that he could always increase speed to {{SMS|Blücher||2}}'s maximum speed of {{convert|23|kn}} if they were British battlecruisers.<ref>Massie, pp. 376–384</ref>

Beatty ordered his battlecruisers to make all practicable speed to catch the Germans before they could escape. ''Indomitable'' managed to exceed 26 knots and Beatty recognised her performance with a signal at 08:55 "Well done, ''Indomitable''"<ref>Massie, p. 385</ref> Despite this achievement ''Indomitable'' was the slowest of Beatty's ships and gradually fell behind the newer and faster battlecruisers. By 10:48 ''Blücher'' had been heavily damaged by fire from all the other battlecruisers and her speed had dropped to {{convert|17|kn}} and her steering gear had been jammed; Beatty ordered ''Indomitable'' to attack her. But due to a combination of a mistake by Beatty's flag lieutenant in signalling, and heavy damage to Beatty's flagship {{HMS|Lion|1910|2}} which had knocked out her radio and caused enough smoke to obscure her signal [[halyard]]s so that Beatty couldn't communicate with his ships, the rest of the battlecruisers turned away from Hipper's main body and engaged ''Blücher''.<ref>Massie, pp. 385–406</ref> ''Indomitable'' fired 134 shells at ''Blücher'' before she capsized and sank at 12:07.<ref name=c25/> After the end of the battle ''Indomitable'' was ordered to tow ''Lion'' back to port as one of her engines had been knocked out, the other was failing and she'd been holed a number of times beneath the waterline. It took over a day and a half at speeds of {{convert|7|-|10|kn}}.<ref>Massie, pp. 410–412</ref>