The Royal Oak is the fourth of the R-class Battleship in E-Country. Her name came from an oak which the E-Country's emperor hid under to escape. Her class was a little different from the Queen-class after modification since her speed can't catch up the Queen-class. The last two ships of R-class were modified into the Renown-class. Royal Oak was famous in history because of her bad luck：She was sank by a G-Country submarine when she was resting in Scapa Flow during night.
E-Country 15in Guns in twin mounts
Royal Oak, the R-Class battleship, joins your fleet today.(Hum...)
I can have a nice siesta with you my admiral from now on. I'm very happy.
Luck-E Club Member
She was outclassed by other warships in WWII. So she stayed in the harbor and acted as a training ship. From her words, there is no doubt that she is an otaku like Tirpitz.
She was sunk by torpedoes launched from G-country submarine U47. However, only one of the torpedoes worked which tore into the bottom of the ship. Because of this, her luck level is E. She and Hood are fellow sufferers in deed. However, Hood is somewhat capable of battles. Royal Oak... well...
Royal Oak and U47
U47 launched 4 torpedoes to Royal Oak at first. One was out of order. Two missed. Only one hit the anchor of Royal Oak.
But the explosion did not alert the sailors on Royal Oak. They just checked roughly and found nothing on fire or exploded.
U47 turned around and launched another torpedo, but it was out of order again.
Till then, U47 had not dealt any damage on Royal Oak. However Royal Oak was not aware of it as well. U47: What the hell didn't I hit that?!
After 15 minutes, U47 decided to launch last wave of torpedoes and returned back. Only two torpedoes were launched, but one of them was detonated by Royal Oak's metal body. The shallow sea made the explosion reflect to Royal Oak and soon her magazine exploded, her guns blew up, and she sank after 13 minutes.
Till then, Royal Oak still did not understand what happened.