Question: who is called a grey beard loon and why

title: Grey Beard
text: He was a leader of the Hotamitaneo ( `` Dog soldier '' ) society of young warriors . He was involved in a skirmish with Edwin Vose Sumner 's troops at the Kansas River in 1857 , and gained recognition among whites in 1867 for battling soldiers under Winfield Scott Hancock and George Armstrong Custer in an attempt to prevent the building of the Kansas Pacific Railroad across tribal lands . He refused to sign the failed Medicine Lodge Treaty , and continued fighting until 1871 , when his people settled on a reservation in Indian Territory . In what is known as the Red River War , he and other chiefs began raiding settlements again in 1874 out of frustration with poaching of buffaloes . After participating in the Second Battle of Adobe Walls , Grey Beard and his followers went into hiding in what is now the Oklahoma Panhandle .