On this day in 1862 (almost 50 years after gaining independence, and not on this day in history) the Mexican army defeated French invaders at the battle of Puebla. The Mexican force was largely outnumbered and was short on supplies, but was able to gain victory by killing almost 500 French soldiers and only losing about 100 of their own. It was more of a moral victory than a strategic one, but is celebrated as a day when the underdog won. So drink up to the French losing a battle, not an unusual event by any means.
On this day in 1945 were the only civilian deaths on the US mainland during WWII. Near Lakeview, Oregon, 6 people, including 5 children, were killed while on a picnic when they discovered an undetonated Japanese balloon bomb. They assumed it was a dud and tried to move it when it exploded. I did this with a firework once, burned my fingers pretty bad.
Finally, on this day in 2004, the body of William McGuire was found chopped to bits and stuffed into two suitcases. The suitcases were found in the waters off of Virginia Beach. His wife was found guilty of his murder and desecrating his corpse. It was found that she shot her husband, chopped him up with a power saw in her shower, and stuffed the remains into the two suitcases. Fellas, don't piss off your wives, bitches be crazy!