// todo need optimize like in event.jsp. Add indexing or not indexing this page. Unrestricted Submarine Warfare (1 ene 1914 año – 31 mayo 1915 año) (Cinta de tiempo)

Unrestricted Submarine Warfare (1 ene 1914 año – 31 mayo 1915 año)

Descripción:

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.