What river was featured in a film serial starring Helen Gibson, and was the site of the Battle of Crow Agency in 1887?
Custer's Last Stand (serial): Custer's Last Stand is a 1936 American film serial based on the historical Custer's Last Stand at the Little Bighorn River. Custer's Last Stand (serial):  This serial stars many famous and popular B-Western actors as well as silent serial star Helen Gibson. Little Bighorn River: The Little Bighorn River is a 138 mi tributary of the Bighorn River in the United States in the states of Montana and Wyoming. Little Bighorn River:  The Battle of the Little Bighorn also known as the Battle of the Greasy Grass was fought on its banks in 1876, as well as the Battle of Crow Agency in 1887.
Little Bighorn River