Weer's habitual drunkenness led to a mutiny among the other officers of the expedition, spearheaded by Colonel Frederick Salomon.

In Blunt's official report on the action at Prairie Grove he praised Weer for behaving with 'gallantry, leading men into the thickest of the fight'.

Weer's main accomplishment was to recruit pro-Union Indians into military service, once this was approved by President Lincoln.

The 1st Regiment, commanded by Colonel Robert Furnas, contained Creek and Seminole warriors, most of whom had fought under Chief Opothleyahola on the fight to Kansas in 1861.

The 2nd Regiment, led by Colonel John Ritchie, contained an assortment of tribesmen, including Cherokees, Caddos, Delawares, Kaws, Kickapoos, Osages, Quapaws and Shawnees.

[9] Weer's drinking again caused his removal from his field command and in 1863 he was assigned to a desk job as assistant adjutant general in St. Louis, Missouri.

Weer and the 10th Kansas Volunteer Infantry took charge of Alton Prison and remained there for the rest of the Civil War.