Indefatigable

Indefatigable (pronounced in-di-fat-i-guh-buhl)

Incapable of being tired out; not yielding to fatigue; untiring.

1580-1590: From the French indefatigable derived from the Latin indēfatīgābilis (untiring; that which cannot be wearied). Construct was in (not) + defatigare (to tire out) from de (utterly, down, away) + fatigare (to weary).  A dictionary of 1656 has an entry for defatigable which does seem to have been used in the seventeenth century before going extinct; a revival in 1948 was a jocular back-formation from indefatigable and one which never caught on.  Related forms are indefatigability & indefatigableness (nouns) and indefatigably (adverb).

HMS Indefatigable was a Royal Navy battlecruiser launched in 1909 and sunk while part of Vice-Admiral Sir David Beatty's battlecruiser fleet in the 1916 Battle of Jutland.

Battlecruisers were essentially battleships with less armor, therefore gaining speed at the cost of greater vulnerability.  The theory was they would have the firepower to out-gun all but the battleships and those they could out-run with their greater speed.  The concept seemed sound and in December 1914, at the Battle of the Falkland Islands, two Royal Navy battlecruisers vindicated the theory when they chased and destroyed the German East Asia Squadron. 

However, in 1916, the performance of the battlecruisers in the Jutland engagement forced the Admiralty to re-consider.  Jutland was the closest thing to the great battle of the fleets which had been anticipated for decades but proved anti-climatic, both sides ultimately choosing to avoid the decisive encounter which offered the chance of victory or defeat.  What it did prove was that the naval theorists had been right; the battlecruiser could not fight the battleship and if their paths threatened to cross, the less-armored vessel should retreat and rely on greater speed to make good her escape.  There were technical deficiencies in the British ships, without which perhaps three of their battlecruisers wouldn’t have been lost, but what happened at Jutland made it clear to the admirals that uneven contests between the big capital ships were to be avoided.

For naval architects, warship design was a three-way tussle between speed, firepower and armor; to add to one was to detract from at least one of the others.  That was difficult enough when constrained only by physics and economics but after the First World War, international agreements limited the maximum tonnage of the big ships so the choice became either to compromise the design or cheat.  Some countries did the former, some the latter but all seemed to agree the battlecruiser was extinct and indeed, after Jutland, no battlecruiser was laid down for over sixty years.  The pocket-battleships of the 1930s, although similar, were a different breed.

It was thus a surprise when the Soviet navy announced the commissioning of five Kirov class battlecruisers, four of which were built, launched during the 1980s and 1990s.  Although the official Russian designation of the ship-type is heavy nuclear-powered guided missile cruiser (тяжёлый атомный ракетный крейсер), but admiralties in the West, still nostalgic about the big ships, choose to revive the old name "battlecruisers".

Before the fall: Soviet nuclear-battlecruiser Kirov at anchor, with a Soviet Krivak I-class guided-missile frigate in the background, December, 1989.  Later re-named the Admiral Ushakov, she and the Admiral Lazarev (ex-Frunze) are now in the throes of being scrapped.

They’re the largest conventional warships launched since World War II; only aircraft carriers and amphibious assault ships have been of greater displacement.  Expensive to operate, only the Pyotr Velikiy (ex-Yuriy Andropov) remains in operational service and according to recent NATO bulletins has been at see as part of a fleet exercise as recently as mid-2021.  Although the Admiral Nakhimov (ex-Kalinin) is currently undergoing a refit and is now scheduled to re-enter service in 2023, the re-commissioning date has shifted many times and NATO sources remain sceptical she will ever return to the active list.