William O'Brien State Park

Historical marker location:

16821 O'Brien Trail North, Marine on St. Croix, Minnesota

( Marker can be reached from Saint Croix Trail North (State Highway 95) 1.5 miles north of Chestnut Street, on the left when traveling north.)

The US-Dakota War of 1862, also known as the Sioux Uprising, was a conflict between the Dakota Sioux and the United States. The war resulted in the execution of 38 Dakota men, the largest mass execution in U.S. history.