It was the naval aspect of the 2nd World War that made it a global war, and this book does a good job in demonstrating that fact. From the River Plate to the North Cape to the Indian Ocean to the Aleutian Islands, the navies of the various powers attempted to project their power all over the globe. These efforts had a significant impact on the outcome of the land war. The small German navy was able to invade Norway, but its surface components were unable to stand toe to toe with the Royal Navy and was largely crippled for the rest of 1940. The U-boats, although very effective during certain phases of the war, were not enough to interdict the Atlantic shipping routes, and therefore unable to exert a decisive influence on the war. The larger Italian navy was more of a match for the British Mediterranean fleet, but Italian unpreparedness for war and reluctance to use their ships led to their failure to capture Malta and embarrassing defeats at Cape Matapan and Taranto. The Japanese navy was the largest of the Axis powers and extremely effective from December 1941 to June 1942, but the defeat at Midway and the attritional battles around Guadalcanal wore them down. Seeking to preserve their main strength in 1943, by the time they were able to deploy another large carrier force, the Americans had already commissioned some 10 of the Essex class fleet carriers, along with countless light and escort carriers. The Battle of the Philippine Sea was an embarrassing defeat for the IJN, only matched by the complete failure of their operations around Leyte Gulf four months later. In the last 18 months of World War 2, the Axis navies were hunted into extinction.
I greatly enjoyed this book, it does not go into very much depth into any particular battles, but it is very good for getting a big picture of the naval aspect of WW2. You will likely learn things you never knew, such as about the French navy after Mers El Kebir, and the embattled Soviet navy.