The basic map to which Curtis overlayed his data, was surveyed in 1891 by R. B. Marshall who became a Big Beaver. www.water.ca.gov/swp/historymarshall.cfm The map post dates the battle by a decade and a half and does not portray theriver as it flowed in 1876. The best that is available is Norris's sketch from 1877. Morrow photographed the ford.
Two couriers came up from Custer requesting re-inforcement, and announcing that he was advancing on the enemy.