Gun count could not rescue an under-protected battlecruiser

In this campaign engagement, Jupiter brings fifteen 15-inch guns against a French battlecruiser's twelve 14.5-inch weapons, but the French ship has about 18 inches of armour to Jupiter's 12. Jupiter initially begins to withdraw, but the apparent gun advantage prompts a decision to fight. Even the secondary-battery comparison cuts against a simple calibre ranking: the French 4.5-inch guns outrange Jupiter's 6-inch battery by about 200 metres, while Jupiter can bring only six 6-inch guns onto a broadside. The French armour holds long enough for its fire to tell, and Jupiter does not land the hits needed to make its larger battery decisive. The post-battle assessment says the withdrawal should have continued and treats the result as a campaign lesson in protection, hit probability, and numerical support rather than proof that gun count alone wins.