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June 15, 2024
201520
17553
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12 h, feb 5, 1915 y - Germany declares a "war zone" around Great Britain

Description:

essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.

Added to timeline:

27 Oct 2017
0
0
289

Date:

12 h, feb 5, 1915 y
Now
~ 109 years ago