Why is "Army of the Frontier" trending?

Wikipedia Overview

The Army of the Frontier was a Union army that served in the Trans-Mississippi Theater during the American Civil War. The army was formed by consolidating existing formations commanded by Brigadier Generals James G. Blunt and John M. Schofield on October 1, 1862, shortly after the First Battle of Newtonia. This army was originally known as the Army of Southwestern Missouri but was renamed to the Army of the Frontier on October 12. Advancing into Arkansas and the Indian Territory, portions of the army were engaged at the Battle of Old Fort Wayne and the Battle of McGuire's Store in late October. Two divisions of the army then returned to Missouri, in preparation to be transferred to the Vicksburg campaign, while the third division, under Blunt, remained in Arkansas and won the Battle of Cane Hill on November 28. In response to a Confederate offensive against Blunt's division, the other two divisions returned from Missouri in time to, along with Blunt's division, repulse the Confederate offensive at the Battle of Prairie Grove on December 7. In late December, the army raided the Confederate supply depot at Van Buren, Arkansas. After the raid, the divisions of the Army of the Frontier were scattered to different points in Missouri and Arkansas. A portion of the army was engaged in the Battle of Chalk Bluff in May 1863. On June 2, most of the men from two divisions of the army were sent to the operations against Vicksburg. The remaining division of the army was assigned to the District of the Border on June 9, and the Army of the Frontier ceased to exist.