may 7, 1915 - Sinking of the RMS Lusitania
Description:
The German U-20 submarine sinks the HMS Lusitania with 128 U. S. citizens on board. The reaction of the United States, the latter officially threatening Germany with entering the war, makes the Kaiser publically announce the end of the unrestricted submarine warfare.Added to timeline:
Date:
may 7, 1915
Now
~ 111 years ago