I record the cost of war in this post, both large scale and small, because it seems to me we should not forget the cost of making conflict mistakes and the people who paid the cost with their lives.
The Battle of the Atlantic between 1939-45 between Britain, Canada, and later the USA and Germany and Italy cost: 30,264 merchant sailors, 28,000 sailors, 3500 merchant ships, 175 warships and 783 submarines (or in the latter case a 75% loss rate). It was a close run thing and nearly lost the allies the war.
Liverpool, UK has a monument to the merchant sailors killed in the battle and modeled on Captain John Walker specifically:
And this is John (1896-1944) who worked himself to death fighting the battle: