He was also an avid horse racer, huntsman, and the leading pitcher on Fort Niobrara's baseball team.S.. There, beginning in February 1891, five troops of the Sixth Cavalry sought to protect area citizens from potential Indian disturbances.
Although he initially viewed them as savage enemies, Private Clark's attitude softened when the army began enlisting Indian men and he befriended a Lakota soldier named Yellow Hand, who shared Clark's love of sports.