13th Century (High Middle Ages)
31st May 1223, Battle Of The Kalka River
Mongolian Empire Forces defeated a Kievan Rus' Eastern Slavic Principality Forces in present day Ukraine with an overwhelming victory.
31st May 1916 To 01st June 1916, Battle of Jutland
The United Kingdom (UK) Royal Navy (RN) Grand Fleet and the Imperial German Navy's High Seas Fleet fought the greatest sea battle the world has ever known, by days end 9,823 lives was lost.
YouTube Video ID No. WTRDYZ419V8