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La '''SMS ''Nassau'''''<ref>"SMS" è l'acronimo di "''[[Seiner Majestät Schiff]]''", "Nave di Sua Maestà" in [[lingua tedesca.]]</ref> fu la prima nave da battaglia tipo [[dreadnought]] costruita per la [[marina imperiale tedesca]], in risposta al varo della {{nave|HMS|Dreadnought|1906|6}}.<ref>{{cita|Hore|p
La ''Nassau'' fu schierata nel [[Mare del Nord]] dall'inizio della [[prima guerra mondiale]], nella II. Division (IIª divisione) del [[I. Geshwader]] (Iª squadra da battaglia) della [[Hochseeflotte]]. Nell'agosto del 1915, partecipò alla [[battaglia del golfo di Riga]] nel [[Mar Baltico]] dove affrontò la nave da battaglia russa {{nave||Slava|nave da battaglia|2}}. Dopo essere ritornata nel Mare del Nord, la ''Nassau'' con la sua squadra, prese parte alla [[battaglia dello Jutland]] il 31 maggio – 1 giugno 1916. Durante la battaglia speronò l'incrociatore britannico {{nave|HMS|Spitfire|1912|6}} danneggiandolo gravemente. Nella battaglia la ''Nassau'' ebbe 11 morti e 16 feriti.
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{{vedi anche|Classe Nassau}}
[[File:Nassau class main weapon.svg|thumb|left|Schema della disposizione delle batterie principali nella classe Nassau]]
La ''Nassau'' era lunga {{converti|146.1|m|ftin|abbr=on|0}}, larga {{converti|26.9|m|ftin|abbr=on}}, ed aveva un'altezza di {{converti|8.9|m|ftin|abbr=on|0}}. [[dislocamento|Dislocava]] {{converti|18873|t|LT|abbr=on}}, che potevano aumentare fino a {{converti|20535|t|LT|abbr=on}}. L'equipaggio consisteva in 40 ufficiali e 968 marinai. La ''Nassau'' manteneva i motori alternativi a vapore a tripla espansione e le caldaie a carbone rispetto alle turbine ed alle caldaie a nafta delle navi più moderne. I tre motori erano progettati per una potenza complessiva di {{converti|16181|kW|ihp|abbr=on}} che gli consentiva una velocità massima di {{converti|20|kn}}. L'autonomia era di {{converti|8300|nmi|lk=in}} a {{converti|12|kn}} di crociera.<ref>{{cita|Gröner|p
La ''Nassau'' era armata con dodici cannoni [[28 cm SK L/45 gun|{{converti|28|cm|in|abbr=on|0}} SK L/45]]<ref>Nella marina imperiale tedesca, "SK" (''Schnelladekanone'') significa che il cannone è a tiro rapido, mentre "L/45" è la lunghezza espressa in [[calibro#Lunghezza riferita al calibro|calibri]]. Si veda a proposito {{cita libro|autore= Germany. Marine Amt|titolo= Die Schnelllade-Kanonen der Schiffs-Artillerie: (für Einheitspatronen) und ihre Munition, nebst Vorschriften für die Behandlung und Bedienung an Bord in Dienst befindlicher Schiffe|url= http://books.google.com/books?id=cWVGAAAAYAAJ|anno= 1898|editore= E.S. Mittler und Sohn}}</ref> posti in sei torrette binate disposte in un originale schema esagonale. Dodici cannoni [[15 cm SK L/45|{{converti|15|cm|in|abbr=on|0}} SK L/45]] e sedici da [[8,8 cm SK L/45 naval gun|{{converti|8,8|cm|in|abbr=on|0}} SK L/45 guns]] costituivano le batterie secondarie poste in [[casamatta]].<ref>{{cita|Gröner|p
== Servizio ==
[[File:SMS Nassau NH 46828.jpg|thumb|left|''Nassau'' early in her career, c. 1909–1910]]
La ''Nassau'' fu ordinata con il nome provvisorio ''Ersatz Bayern'', come sostituta della {{nave|SMS|Bayern|1878|2}}. Lo scafo fu impostato in cantiere il 22 luglio 1907 presso i cantieri ''[[Kaiserliche Werft Wilhelmshaven|Kaiserliche Werft]]'' di [[Wilhelmshaven]], con il numero di cantiere 30.<ref>{{cita|Gröner|p
L'allestimento subì un grave ritardo a causa dell'allagamento dello scafo in allestimento dovuto ad un errore umano, lo scafo non era dotato ancora delle paratie antiallagamento e l'allagamento si estese per gran parte della nave che si inclinò su di un lato e affondò di {{convert|1.6|m|abbr=on}} adagiandosi sul fondo del bacino di carenaggio. Il lavoro di eusarimento e pulizia si rivelò lungo e laborioso.<ref>{{cita|Staff|p
[[File:First and second battleship squadrons and small cruiser of the - NARA - 533188-2 restored.jpg|thumb|La ''Nassau'' in linea con il resto della sua squadra il [[I. Geschwader]], 2. Division a [[Kiel]] prima della guerra]]
Il 16 ottobre 1909, la ''Nassau'' e la sua pariclasse {{nave|SMS|Westfalen||2}} parteciparono ad una cerimonia per l'apertura del terzo canale di accesso ai cantieri navali di Wilhelmshaven.<ref>{{cita|Staff|pp
La ''Nassau'', durante la guerra, partecipò a tutte le sortite della Hochseeflotte nel Mare del Nord.<ref>{{cita|Staff|p
=== Battaglia del Golfo di Riga ===
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In August 1915, the German fleet attempted to clear the [[Gulf of Riga]] to facilitate the capture of [[Riga]] by the [[German Army (German Empire)|German Army]]. To do so, the German planners intended to drive off or destroy the Russian naval forces in the area, which included the pre-dreadnought battleship {{nave|Russian battleship|Slava||2}} and a number of gunboats and destroyers. The German naval force would also lay a series of [[naval mine|minefields]] in the northern entrance to the gulf to prevent Russian naval reinforcements from being able to enter the area. The fleet that assembled for the assault included ''Nassau'' and her three sister ships, the four {{nave|Classe Helgoland|2}}s, and the battlecruisers {{nave|SMS|Von der Tann||2}}, {{nave|SMS|Moltke||2}}, and {{nave|SMS|Seydlitz||2}}. The force would operate under the command of Vice Admiral Franz von Hipper. The eight battleships were to provide cover for the forces engaging the Russian flotilla. The first attempt on 8 August was unsuccessful, as it had taken too long to clear the Russian minefields to allow the minelayer {{nave|SMS|Deutschland|1914|2}} to lay a minefield of her own.<ref>{{cita|Halpern|pp
On 16 August 1915, a second attempt was made to enter the gulf: ''Nassau'' and ''Posen'', four light cruisers, and 31 torpedo boats managed to breach the Russian defenses.<ref>{{cita|Halpern|p
<blockquote>
"To keep valuable ships for a considerable time in a limited area in which enemy submarines were increasingly active, with the corresponding risk of damage and loss, was to indulge in a gamble out of all proportion to the advantage to be derived from the occupation of the Gulf ''before'' the capture of Riga from the land side."<ref>{{cita|Halpern|p
</blockquote>
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[[File:Map of the Battle of Jutland, 1916.svg|thumb|350px|Maps showing the maneuvers of the British (blue) and German (red) fleets on 31 May – 1 June 1916]]
{{Main|Battle of Jutland}}
''Nassau'' took part in the inconclusive Battle of Jutland on 31 May – 1 June 1916, in the II Division of the I Battle Squadron. For the majority of the battle, the I Battle Squadron formed the center of the [[line of battle]], behind Rear Admiral Behncke's III Battle Squadron, and followed by Rear Admiral Mauve's elderly pre-dreadnoughts of the II Battle Squadron. ''Nassau'' was the third ship in the group of four, behind ''Rheinland'' and ahead of ''Westfalen''; ''Posen'' was the squadron's flagship.<ref>{{cita|Tarrant|p
Between 17:48 and 17:52, eleven German dreadnoughts, including ''Nassau'', engaged and opened fire on the British 2nd Light Cruiser Squadron; ''Nassau''{{'}}s target was the cruiser {{nave|HMS|Southampton|1912|2}}. ''Nassau'' is believed to have scored one hit on ''Southampton'', at approximately 17:50 at a range of {{convert|20100|yd|m|abbr=on}}, shortly after she began firing. The shell struck ''Southampton'' obliquely on her port side, and did not cause significant damage.<ref>{{cita|Campbell|p
''Nassau'' and the rest of the I Squadron were again engaged by British light forces shortly after 22:00, including the light cruisers {{nave|HMS|Caroline|1914|2}}, {{nave|HMS|Comus|1914|2}}, and {{nave|HMS|Royalist|1915|2}}. ''Nassau'' followed her sister ''Westfalen'' in a 68° turn to starboard in order to evade any [[torpedo]]es that might have been fired. The two ships fired on ''Caroline'' and ''Royalist'' at a range of around {{convert|8000|yd|m|abbr=on}}.<ref>{{cita|Campbell|p
[[File:HMSSpitfireJutlanddamage.jpg|thumb|left|Damage to HMS ''Spitfire'' after being rammed by ''Nassau'']]
At around midnight on 1 June, the German fleet was attempting to pass behind the British Grand Fleet when it encountered a line of British destroyers. ''Nassau'' came upon the destroyer {{nave|HMS|Spitfire|1912|2}}, and in the confusion, attempted to ram her. ''Spitfire'' tried to evade, but could not maneuver away fast enough, and the two ships collided. ''Nassau'' fired her forward 11-inch guns at the destroyer. They could not depress low enough for ''Nassau'' to be able to score a hit; nonetheless, the blast from the guns destroyed ''Spitfire''{{'}}s [[bridge (nautical)|bridge]]. At that point, ''Spitfire'' was able to disengage from ''Nassau'', and took with her a 6 m (20 ft) portion of ''Nassau''{{'}}s side plating. The collision disabled one of ''Nassau''{{'}}s 15 cm (5.9 in) guns, and left a 3.5 m (11.5 ft) gash above the waterline; this slowed the ship to {{convert|15|kn}} until it could be repaired.<ref>{{cita|Tarrant|p
Shortly after 01:00, ''Nassau'' and {{nave|SMS|Thüringen||2}} encountered the British armored cruiser {{nave|HMS|Black Prince|1904|2}}. ''Thüringen'' opened fire first, and pummeled ''Black Prince'' with a total of 27 heavy-caliber shells and 24 shells from her secondary battery. ''Nassau'' and {{nave|SMS|Ostfriesland||2}} joined in, followed by {{nave|SMS|Friedrich der Grosse|1911|2}}. The heavy fire quickly disabled the British cruiser and set her alight; following a tremendous explosion, she sank, taking her entire crew with her.<ref>{{cita|Tarrant|p
Following her return to German waters, ''Nassau'', her sisters ''Posen'' and ''Westfalen'', and the ''Helgoland''-class battleships {{nave|SMS|Helgoland||2}} and ''Thüringen'', took up defensive positions in the [[Jadebusen|Jade]] [[roadstead]] for the night.<ref>{{cita|Tarrant|p
=== Later operations ===
[[File:SMS Nassau illustration.jpg|thumb|left|A recognition drawing prepared by the Royal Navy, with ''Nassau''{{'}}s main battery turned to starboard]]
[[Action of 19 August 1916|Another fleet advance]] followed on 18–22 August, during which the I Scouting Group battlecruisers were to bombard the coastal town of [[Sunderland, Tyne and Wear|Sunderland]] in an attempt to draw out and destroy Beatty's battlecruisers. As only two of the four German battlecruisers were still in fighting condition, three dreadnoughts were assigned to the Scouting Group for the operation: {{nave|SMS|Markgraf||2}}, {{nave|SMS|Grosser Kurfürst|1913|2}}, and the newly commissioned {{nave|SMS|Bayern||2}}. The High Seas Fleet, including ''Nassau'',<ref>{{cita|Staff|p
Another sortie into the North Sea followed on 19–20 October. On 21 December, ''Nassau'' ran aground in the mouth of the [[Elbe]]. She was able to free herself, and repairs were effected in [[Hamburg]] at the Reihersteig Dockyard until 1 February 1917.<ref>{{cita|Staff|p
''Nassau'' and her three sisters were to have taken part in a [[Naval order of 24 October 1918|final fleet action]] at the end of October 1918, days before the [[Armistice of 11 November 1918|Armistice]] was to take effect. The bulk of the High Seas Fleet was to have sortied from their base in Wilhelmshaven to engage the British Grand Fleet; Scheer—by now the [[Grand Admiral]] (''Großadmiral'') of the fleet—intended to inflict as much damage as possible on the British navy, to improve Germany's bargaining position, despite the expected casualties. Many of the war-weary sailors felt that the operation would disrupt the peace process and prolong the war.<ref>{{cita|Tarrant|pp
=== Fate ===
Following the German collapse in November 1918, a significant portion of the High Seas Fleet was interned in [[Scapa Flow]]. ''Nassau'' and her three sisters were not among the ships listed for internment, so they remained at German ports.<ref>{{cita|Hore|p
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