Dewey Beard or Wasú Máza ("Iron Hail", 1858–1955) was a Minneconjou Lakota who fought in the Battle of Little Bighorn as a teenager.

[1] After George Armstrong Custer's defeat, Wasu Maza followed Sitting Bull into exile in Canada and then back to South Dakota where he lived on the Cheyenne River Indian Reservation (in Dewey and Ziebach counties).

[2] Iron Hail joined the Ghost Dance movement and was in Spotted Elk's band along with his parents, siblings, wife and child.

In the early 1940s Beard and his wife Alice were raising horses on their land on the Pine Ridge Indian Reservation.

They were compensated by the government for their land in installments which were too low to enable them to afford more property, and as a result they both moved into a poor section of Rapid City, South Dakota.