The Mexican victory at Puebla in 1862 against a much larger French army. It is a minor day in most of Mexico and a large one in the United States, where it became a festival of Mexican-American identity.
5 May, the anniversary of the battle of Puebla in 1862.
The Phala almanac gives the exact day for your own city; the lunar and solar rules above are what it computes from.
A Mexican army of about four thousand, badly equipped, held off a French force twice its size at Puebla. It did not end the war — the French took Mexico City the next year — but it was the first proof that they could be held.
It is not Mexican independence day, which is 16 September, and it is a minor date in most of Mexico. It became a large festival in the United States instead, first among Mexican-Americans in California and then generally.
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