The Battle of Christiana was a confrontation that occurred on September 11, 1851, in Christiana, Pennsylvania, between a group of African American and white abolitionists and U.S. marshals trying to apprehend escaped slaves. This event marked a significant moment in the struggle against the Fugitive Slave Act, as it highlighted the fierce resistance of the Underground Railroad communities to federal efforts to reclaim fugitive slaves. The battle underscored the growing tensions between pro-slavery forces and those advocating for freedom and civil rights.