eggs, but frequently kills the birds." McReynolds understood Devlin had acquired his horses in the same manner the Jayhawk got its prey, and used the term in a Southern Kansas Herald newspaper column to describe a case of theft in the ongoing partisan violence. The term was quickly picked up by other newspapers, and "Jayhawkers" soon came to denote the militants and thieves affiliated with the Free State cause. Kansas Union troops The meaning of the jayhawker term evolved in the opening year of the American Civil War. When Charles Jennison, one of the territorial-era jayhawkers, was authorized to raise a regiment of cavalry to serve in the Union army, he characterized the unit as the "Independent Kansas Jay-Hawkers" on a recruiting poster. The regiment was officially termed the 7th Regiment Kansas Volunteer Cavalry, but was popularly known as Jennison's Jayhawkers.Starr, p. 57. Thus, the term became associated with Union troops from Kansas. After the regiment was banished from the Missouri–Kansas border in the spring of 1862, it went on to participate in several battles including Union victories of the Battle of Iuka and the Second Battle of Corinth. Late in the war, the regiment returned to Kansas and contributed to Union victory in one of the last major battles in the Missouri–Kansas theater, the Battle of Mine Creek. The Jayhawker term was applied not only to Jennison and his command, but to any Kansas troops engaged in punitive operations against the civilian population of western Missouri, in which the plundering and arson that characterized the territorial struggles were repeated, but on a much larger scale. For example, the term "Jayhawkers" also encompassed Senator Jim Lane and his Kansas Brigade, which sacked and burned Osceola, Missouri, in the opening months of the war after their defeat by Sterling Price's Missouri State Guard in the Battle of Dry Wood Creek.Benedict, Bryce. Jayhawkers: The Civil War Brigade of James Henry Lane. University of Oklahoma Press, 2009. Jayhawking in western Missouri Jayhawking was a prominent aspect of Union military operations in western Missouri during the first year of the war. In addition to Osceola, the smaller Missouri towns of Morristown, Papinsvile, Butler, Dayton, and Columbus and large numbers of rural homes were also pillaged by Kansas troops led by James Lane, Charles R. Jennison, Daniel Read Anthony, and James Montgomery, among others. Scores if not hundreds of Missouri families were burned out of