The largest American action to take place during WW1 was also one of the bloodiest to be seen during the war. The Hundred Day Offensive ended with over one million casualties on both sides.
Battle of the Argone Forest.
The Battle of Little Big Horn
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American and British mainly. By that time in the war there where armed forces from many nations involved to some degree. It was the largest battle American forces engaged in and the battle that resulted in the highest number of American casualties of the European war.
The destruction of the Spanish Fleet at Manila Bay.
John Allen, American Revolutionary War hero, killed in action during battle.
The Battle of Little Big Horn
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Saratoga
The Naval Battle at Manila Bay.
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Gettysburg
Battle of Leyte Gulf
American and British mainly. By that time in the war there where armed forces from many nations involved to some degree. It was the largest battle American forces engaged in and the battle that resulted in the highest number of American casualties of the European war.
The destruction of the Spanish Fleet at Manila Bay.
The bloodiest and largest battles were the sea fights surrounding Guadalcanal. Two of which were the Battle of Savo Island and the Battle of Friday the 13th. Two USN Admirals were killed in action during these sea battles.
The BATTLE OF JUTLAND was the largest naval battle in World War I.