unrestricted submarine warfare

unrestricted submarine warfare
Name	Unrestricted submarine warfare
Partof	Naval warfare

unrestricted submarine warfare is a naval strategy that involves submarines attacking merchant and civilian vessels without warning, in contrast to established prize rules requiring warning and provision for crew safety. This approach prioritizes the disruption of enemy logistics and economic warfare over traditional laws of war governing naval conflict. Its implementation has been a major factor in total war and has significantly influenced international law and diplomatic history.

Definition and concept

The core concept involves submarines operating without the constraints of cruiser rules, which mandated that a warship stop and search a merchant vessel, ensure the safety of its crew, and only sink it under specific conditions. This strategy treats the economic blockade as a primary war aim, directly targeting a nation's war effort by crippling its maritime trade. Proponents argued it was a necessary response to the blockade of Central Powers ports by the Royal Navy during World War I. The policy deliberately blurs the line between combatant and non-combatant at sea, making any vessel in a defined war zone a legitimate target.

Historical development

Early use of submarines in the American Civil War and the Russo-Japanese War hinted at their potential, but international consensus, codified in the Declaration of Paris and the Hague Conventions, upheld cruiser rules. The Imperial German Navy, under leaders like Alfred von Tirpitz, developed the doctrine as a counter to British sea power. The first major declaration came from the German Empire in 1915, though initial restrictions were later temporarily relaxed under pressure from the United States following incidents like the sinking of the RMS Lusitania. The evolution of the U-boat fleet and tactics at the Kaiserliche Marine's headquarters in Wilhelmshaven was central to this development.

World War I

The strategy was first implemented on a large scale by Germany during World War I. The first campaign in 1915, which included the sinking of the RMS Lusitania, caused the loss of American lives and contributed to diplomatic tensions with President Woodrow Wilson. Resumed fully in 1917 under the leadership of Erich Ludendorff and endorsed by Kaiser Wilhelm II, it aimed to starve Great Britain into submission before the American Expeditionary Forces could arrive. The devastating success of U-boats in campaigns like the one detailed in the Arabic pledge nearly succeeded, but ultimately provoked the United States Congress to declare war following the Zimmermann Telegram, a decisive turning point in the conflict.

World War II

During World War II, Nazi Germany's Kriegsmarine, commanded by Karl Dönitz, initiated unrestricted warfare immediately with the outbreak of war in 1939, leading to the early sinking of the SS Athenia. The ensuing Battle of the Atlantic pitted U-boat wolfpacks against Allied convoy systems protected by the Royal Canadian Navy and United States Navy. In the Pacific Theater, the United States Navy under Admiral Chester W. Nimitz also employed the strategy against Japanese merchant shipping, devastating the Empire of Japan's supply lines from regions like the Dutch East Indies. Key technological developments like sonar, Hedgehog, and Ultra intelligence were critical Allied responses.

Legal and ethical considerations

The strategy has been heavily contested under international law. The London Naval Treaty and later the 1936 London Naval Treaty sought to reaffirm prize rules, but these were largely ignored. Post-war, the Nuremberg trials addressed the issue, though charges against Dönitz for his role in the Battle of the Atlantic were not pursued vigorously. The modern United Nations Convention on the Law of the Sea and protocols added to the Geneva Conventions continue to grapple with the legality of such tactics, which are often viewed as violations of the principles of distinction and proportionality in the law of armed conflict.

Impact on naval strategy

The doctrine fundamentally altered naval warfare, shifting focus from fleet engagements between battleships like those at Jutland or Midway to a war of attrition against merchant marine fleets. It necessitated the development of comprehensive anti-submarine warfare tactics and technologies, which became a cornerstone of Cold War naval planning for both NATO and the Warsaw Pact. The strategy also cemented the submarine's role as a key platform for power projection and deterrence theory, later evolving into the central element of nuclear triad strategies with the advent of ballistic missile submarines like the Ohio-class submarine.

Category:Naval warfare Category:Military strategy Category:Submarine warfare