Unrestricted Submarine Warfare (1 jan 1914 ano – 31 maio 1915 ano)
Descrição:
Germany pursued a highly effective U-boat campaign against merchant ships. On 4 February 1915, Germany declared a war zone around Britain, within which merchant ships were sunk without warning.
Adicionado na linha do tempo:
Data:
1 jan 1914 ano
31 maio 1915 ano
~ 1 years and 4 months