Frederick Douglass and John Brown. The two abolitionists met at a stone quarry here, Aug. 19-21, 1859, and discussed Brown's plans to raid the federal arsenal at Harpers Ferry. He urged Douglass to join an armed demonstration against slavery. Douglass refused, warning the raid would fail; the Oct. 16, 1859 attack confirmed his fears. Brown was captured with his surviving followers and was executed Dec. 2, 1859.