The primary Atlantic campign was fought in the North Atlantic between the Allies and the German U-boat fleet in a life and death struggle to keep the sea lanes between America and Britain open. The campaigns in the Atlantic sea areas were of lesser imprtance compared to the strugge in the North Atlantic, but not unimprtant. The Cribbean was of coinsiderabke imprtnce becuse of the oil production and refining capvility in the area and thefct that the bauxite needed to produce aluminum was being shipped though the Caribbean. The most important naval bttles sea battles was fought between the Italian Regio Marina and British Royal Navy in the Mediterranean. This largely determined the outcome in the North African struggle and blocked Axis access to Middle Eastern oil. There were also naval campaigns in the Baltic and Black Seas. Campaigs that are poorly covered in World War II histories. The Baltic until the last year of the War became essentilly a German lake. The Black Sea was more of a contest and played a role in the Eastern Front campaign in the Ukranian. The substantial Soviet naval force at the onset of Barbarossa was largely negated and destroyed by German air power. The British naval victories in the Medterranean, however, meant that the Axis was unable to introduce substantial naval forces in the Black Sea.
The Allked convoys to supply the Soviet Union had to fight their way through the Barents Sea. This was especially important necuse unlike the Iranian and Pacifuc route, it allowed war material to be delivered near the actual battlefield.It was a particularly deadly oute necause the cold water meant that there would be few survivors when ships were sunk. And the Germans dployed subdtanial assetts to ttck the comvoys. It would be the onmly effective use of the huge occupation force that Hitler deployed in Norway. We We have generally covered this campaign under the Arctic Ocean.
The pre-War Soviet fleet played a minor role in the war. Much of the Soviet fleet was deployed in the Baltic Sea. When the NAZIs invaded (June 1941), the Wehrmacht rapidly moved east and seized almost all of the Baltic ports. Soviet ships had to withdraw to Leningrad and Kronstadt where they were impobilized by Finnish and German minefields. Thus imbolized, the Soviets ships were mauled by Luftwaffe attacks. The Kriegsmarine primary assignment in World War II was to disrupt the Atlantic convoys and cut off Britain from America and te Dominions. It filed in this key assignment. The Kriegsmarine operations in the Baltic, however, were enormously successful. The Germans turned the Baltic into essentially a German lake. Soviet naaval operations were limited in 1941 and 42 and in 1943 the Soviets did not succeed in getting one ship or submarine through the anti-submarine nets and mines streaching from Helsinki to Tallinn. This meant that shipments of metal ores and other products from Sacandavia could freelt flow show to support the German war effort. This situation did not change until the Finns withdrew from the War (July 1944) and the Red Army began to take Baltic ports. The role of the Kriegsmarine changed as the Red Army offenses in the east drove toward the Baltics and East Prussia. The Kriegsmarine successfully evacuated about 2.5 million Baltic and German civilians and soldiers to German ports. The Soviet Navy attempted to prevent this but largely failed. This operation still stands as the largest sea-rescue operation ever conducted.
At the time that Hitler and Stalin launched World War II by invading Poland (September 1939), the Soviet Red Navy dominated the Black Sea. None of the other Black Sea countries (Turkey, Bulgaria, and Romania) had sizable navies. The Germans forced Bulgaria and Romania which had been desmembered by the Soviets into the Axis. Turkey wavered, but was concerned with Soviet aspirations to control the Bosporus ad Dardanelles. British naval victories in the Mediterranean (1940-41) meant that the Axis was unable to introduce major fleet elemets into the Black Sea. and it meant that the Mediterranean could not be a conduit for Middle eastern oil. The Axis naval campaign in the Black Sea to support Barbarossa was an international effort with units from Bulgaria, Croatia, Germany, Italy, and Romania confronting the much larger Red Navy Black Sea force. Many of the smaal boats deployed bt the Axis force were brought to the Black Sea by rail and canal. Unfortunately for the Red Navy, the Black Sea is an enclsed sea, all of which is acceable by air bases surrounding it. And while the Black Sea was not a German prioroty in the first week of Barbarossa, the Red Air Force and its substantial and vulnerable forward deploymment. The Germans basically destroyed the Red Air Force during the first week of Barbarossa--much of it on the ground. This meant that for the first two years of the conflict in the East, the Red Navy had little or no air cover. And during the War most of the major Red Navy ships were lost--mostly the result of air attacks. The Black Sea campaign was largely fought in support of the land campaigns fought in the Ukraine, most prominently the Crimea. The Crimea is a peninsula which juts out into the Black Sea and from an early point it would dominate the Black Sea campaign. For the Germans, the Black Sea was potentially of great importance, especially when Hitler shifted the focus of the campaign to the south (1942). Logistics were one of the most serious problems the Germans faced, With Barbarossa the battles were being fought huge distances from the war industries and supply depots in the Reich. Thus men and material had to be transported by rail requiring a major logistical effort which was vulnerable to Soviet attck. Control of the Black would provide a safe, efficent supply line, especially in 1942 when the Germans smashed through the Don Bend and entered southern Russia and the Caucauses. It also mean a safe route for transporting the oil of the Causes back to Axic countries where it could be shipped on to the Reich. The Soviet naval campaign was overseen primarily by Vice Admiral Filipp Oktyabrskiy. Another major factor other than the Soviet Black sea fleet units was the shipyards which built and maintaned the fleet. The major Soviet shipyards were located in the Ukraine (Nikolayev) and Crimea (Sevastopol). Both were occupied by the Germans during Barbarossa campign (1941). Fleet units including still uncompleted ships were evacuated to harbors in Georgia which would be the only port cities the Red Army was able to protect. These thus became the bases for the surviving fleet. These Georgian ports like Poti had very limited repair facilities. This significantly impaired the operational capability of Black Sea Fleet.
The Caribbean was a quiet theater during the first year of War. The German Western Offensive (May-June 1940) meant that France and the Netherlands were overrun. The Dutch Islands declared loyalty to the London Government in Exile, but the French islands declared loyalty to Vichy which was collaborating with the NAZIs. Elements of the French fleet were moved to Martinique. And it believed that some German U-boats resupplied there, but we have not been able to find any actual documentation on this. Major action in the Caribbean did not occur until Hitler declared war on America (December 1941). The Caribbean naval campaign occurred in connection with Operation Drumbeat off the American East Coast (1942). The Caribbean naval campaign despite in closeness to the United States and importance is perhaps the most poorly covered of all the different sea campaigns. In fact only dedicated students of World War II are aware that an important naval campaign was fought there. The Caribbean was important for three basic reasons, but primarily because of oil. 1) The largest oil refinery in the world was located on Dutch Curaçao and a smaller but still important one on Aruba. It was here that Venezuelan oil was being refined. And Britain's largest refinery was located on Trinidad--much larger than the Middle Eastern refineries. Mexican oil as well as the all-important American Gulf of Mexico production had to come from the same general area. (The American oil transport problem was eased by constructing pipelines during the War.) But Caribbean oil was vital to Britain at the beginning of the War and continued to be important throughout the War. And it is why German and Italian U-boats targeted tankers in the area to some effect, especially in 1942. Merchant shipping cold basically carry any cargo, to transport oil you needed a purpose-built tankers. And ass the War unfolded, they were in perilously short supply. And the Axis submarines managed to sink quite a number of tankers in the Caribbean and along the American Atlantic seaboard. This could have seriously affected the Allied war effort had Henry Kaiser's Liberty Ships not solved the problem. 2) The Caribbean was also of considerable importance is the fact the bauxite was produced in the Caribbean area and had to be shipped through the Caribbean to reach smelters in the United States and Canada. Bauxite was the ore needed to produce aluminum, which was vital in the Air War. 3) In addition, American naval and merchant shipping destined for the Pacific had to transit the Caribbean to reach the Panama Canal. There wee other valuable resources obtained from the Caribbean, but the above reasons are why it was so important. The U.S. Navy did not prepare for a naval campaign off its Atlantic Seaboard or in the Caribbean. And its reaction to the German and Italian attacks was slow, in part because of the crisis in the Pacific. Once American resources were deployed to the Caribbean and personnel trained in ASW tactics, the Axis submarines were doomed. They operated under severe disadvantages. The Caribbean is much more shallow than the North Atlantic and the water clearer. The entire Caribbean was within the range of Allied air cover. Most of the tanker losses occurred in 1942. We have some individual island pages.
The Mediterranean became an active theater of war when Italy entered the war (June 1940). Italy had a modern fleet and with France out of the War, immediately challenged the beleagered Royal Navy for control of the Mediterranean.
With the fall of France some British leaders counceled evacuating Malta and withdrawing from the Meditrranean. Churchill and the War cadinet decided to fight it out with the Italians in a series of epic sea battles.
The Italian fleet supported by air bases in Libya, Sicily, and Italy posed a formidable challenge. The British controlled the two entances to the Mediterranean (Suez and Gibraltar). In between and in many ways the key to the Mediteranean was the small British bastion at Malta. Malta became the most bombed place in the War. It survived in part because of an American carrier (badly needed in the Pacific) delivered fighters and American tanker running the gauntlett of Axis airpower. When the Italians faltered, they were bolstered by German first by the Luftwaffe and then by Rommel's Afrika Corps. Italy's entrance into the War brought important asetts into the NAZI war effort which could be arrayed against Britain. It also meant, however, that Britain was able to bring its greatest assett, the Royal Navy, to bare against the Axis.
Unlike World War I, the North Sea did mot play an important role in the War. This is largely bcause the Germans erly in the War acquired ccess to the French Atlanyic ports and could conmduct their ca,pign against Allied Atlntic comvoys much more effectively from those ports. In ddition the growing power and effectivemess of air power made navcal operations there virtually suisidal, unless the ships had air cover. The Germans continued shipping Swedish iron ore from Norway until finally losing control of the air even in ciastal waters (1944),
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