From the record
“Fort Dilts was a makeshift sod fort built near Rhame, North Dakota, United States, in September 1864 to fend off attacks by Hunkpapa Sioux Indians led by Sitting Bull upon an encircled wagon train of would-be gold-miners and a small military escort of convalescent soldiers.”
Wikipedia article Fort Dilts, CC BY-SA 4.0.
One of 2 National Register listings published here for Bowman County · listed in 1980 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service