Britain at Sea!
The Royal Navy suffered huge losses in the early stages of the war but was still able to play a major role in keeping the United Kingdom supplied with food, arms and raw materials and in defeating the German campaigns of unrestricted submarine warfare in the first and second battles of the Atlantic.
"Of all the branches of men in the Forces, there is none which shows more devotion and faces grimmer perils than the submariner. Great deeds are done in the air and on the land; nevertheless, nothing surpasses your exploits." Winston Churchill.