Unrestricted Submarine Warfare (1 янв 1914 г. – 31 май 1915 г.)
Описание:
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.Добавлено на ленту времени:
Дата:
1 янв 1914 г.
31 май 1915 г.
~ 1 years and 4 months