One. The Battle of Antietam.
The reason I say one is because the Confederacy has better War Generals, they had a more experienced militia. That’s why they were undefeated for so long. But The battle of Antietam of 1862 was the battle the Union, the North, celebrated because of their first victory against the Confederacy, the South.
After a coup d'etat in Spain overthrew the government, Augustin de Iturbide proclaimed the independence of Mexico or Mexican Independence. He was also known by the name of Augustin of mexico. He was born on 27th of September in the year 1783 and died on 19th of July in the year 1824.
Answer is Boers. They're most famous for the Boer Wars in South Africa when the Dutch Boers fought the British Empire (They lost).
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