Oldest
Napoleonic Wars: Britain seizes Guadeloupe.
World War II: The Babi Yar massacre comes to an end.
Åbo Bloodbath: Fourteen gentries who opposed Duke Charles were decapitated in the Old Great Square of Turku (Swedish: Åbo) for their involvement in the power struggle between King Sigismund and Duke Charles and the related peasant revolt known as the Cudgel War.
Newest
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