DKM Bismarck in 1940 was sunk in a duel with battleships and cruisers of the Royal Navy after a prolonged chase. She suffered more then 2000 lost.
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Antietem was the worst day for casualties for over 23,000 union and confederate troops died.
Mustard Gas caused the most casualties and deaths in WWI.
It is called "Death Day" because it was one of the worst battles in world war 2, it had more casualties then any other battle.
First tell us which battle you are talking about and on which side the 'lost batallion' was fighting.
The worst fighting in Europe was during World War 2 1914-1918 and World War 2 1939-1945.