In 1855, Kagi traveled west and stayed at the cabin of his sister Barbara Kagy Mayhew and her husband Allen in
Nebraska City. The
Mayhew Cabin was the first site in Nebraska recognized by the
National Park Service as it was used as part of the Underground Railroad. While living with the Mayhew's, Kagi earned the ability to practice law and taught Phonography. By 1856, Kagi went south to join the
abolitionists working to make Kansas a free state, serving under General
James H. Lane. He was imprisoned in
Lecompton, then at
Tecumseh, Kagi and Brown returned with their men to Kansas, where they lived in a reinforced cabin on Little Sugar Creek, near
Mound City. In November 1858, Kagi and others defended the cabin from an armed
posse while Brown was away. On December 20, 1858, Brown led twelve men, and Kagi led another party of eight men, into
Missouri to free slaves. Brown's party freed ten slaves, but Kagi's freed only one and killed the slave's owner. According to Douglass's later account, Brown described the planned raid in detail and Douglass advised him against it. Kagi was killed by militia forces during the Harper's Ferry raid as he tried to escape across the
Shenandoah River from Hall's Rifle Works. His body was first buried, with most of the other raiders killed during the raid, in a packing crate on the far side of the Shenandoah. Forty years later, in 1899, the remains of Kagi and nine other raiders were reinterred in a common grave next to John Brown's grave at
John Brown Farm State Historic Site. ==In popular culture==