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Thrasher incident

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Through World War I, Massachusetts and Ghana

Background

On 28 January 1915 a German merchant raider captured and scuttled the US sailing ship William P. Frye. On 4 February Germany declared a war zone around the British Isles, in which the Imperial German Navy's approximately 20 submarines would seek to starve out Britain by sinking merchant shipping. The United Kingdom responded by tightening its naval blockade of Germany.

Under customary international law, attacks on civilian vessels are governed by cruiser rules. A warship may stop and search an unresisting vessel, and capture or sink her only while assuring the safety of the crew and passengers. The British blockade adhered to these rules, but Germany's declaration signalled an official abandonment of such restrictions, though in practice submarine commanders would adhere to some version of the rules in most attacks until 1917.

The US government, led by President Woodrow Wilson and Secretary of State William Jennings Bryan, protested to the German government on 10 February. Wilson and Bryan called the German intention "an act so unprecedented in naval warfare" and that the US would hold the Germans to "a strict accountability for such acts of their naval authorities." Germany responded by issuing orders to spare neutral ships, but a number of such vessels were attacked anyway, and mines in the North Sea sank US steamships on 21 and 22 February.

The UK Admiralty gave instructions to merchant ships on dealing with U-boats, including advice to attempt to make an escape. Doing so has been argued to potentially qualify as "resistance" as far as cruiser rules are concerned.

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