Helgoland-class battleship
Class of ship
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The Helgoland class was the second class of dreadnought battleships to be built for the German Kaiserliche Marine. Constructed from 1908 to 1912, the class comprised four ships: Helgoland, the lead ship; Oldenburg; Ostfriesland; and Thüringen. Wikipedia
Armament: 12 × 30.5 cm (12 in) guns; 14 × 15 cm (5.9 in) guns; 14 × 8.8 cm (3.5 in) guns; 6 × 50 cm (20 in) torpedo tubes
Armor: Belt: 300 mm (11.8 in); Decks: 63 mm (2.5 in); Barbettes: 300 mm; Turrets: 300 mm
Built: 1908–1912