Unrestricted Submarine Warfare (1 janv. 1914 – 31 mai 1915)
Description:
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.Ajouté au bande de temps:
Date:
1 janv. 1914
31 mai 1915
~ 1 years and 4 months