On 11 September 1851 in Christiana, Pennsylvania, a group of African Americans and white Quaker abolitionists of the Black Self-Protection Society clash with a Maryland posse of slave owners and U.S. marshals intent on capturing four fugitives; enslaved African Americans hidden in the town.
The Christiana Riot
On 11 September 1851 in Christiana, Pennsylvania, a group of African Americans and white Quaker abolitionists of the Black Self-Protection Society clash with a Maryland posse of slave owners and U.S. marshals intent on capturing four fugitives enslaved African Americans hidden in the town.

I thought there would be more but I Googled to read the history of this. It's a shame that schools do not teach the history of slavery and the efforts for freedom, the fighting that led to the civil war, and the struggle since. Even more a shame is the current administration threatening to withdraw funding from schools that teach this history.
Sorry, Steve, I had the date and a few bits of information but not enough to fill a blog post. Plus my wife has me making cocktails. After the watermelon mojito, she wants a watermelon Margherita.
A happy wife leads to a happy life. Enjoy the cocktails!