Bishop Whipple's Justice Work

"Henry Benjamin Whipple, the first Episcopal bishop of Minnesota, is known for his missionary work among the Dakota and Ojibwe and his efforts to reform the U.S. Indian administration system. After the U.S.–Dakota War of 1862, Whipple was one of the few white men to oppose the death sentences of 303 Dakota." https://www.mnopedia.org/person/whipple-henry-benjamin-1822-1901#:~:text=Henry%20Benjamin%20Whipple%2C%20the%20first,Indian%20administration%20system

As that site indicates, he continued to work for the growth of the Episcopal Church in Minnesota and also on behalf of Native Americans. 

Here is a book he owned, about the colonial wars of the 1670s. 

See also: https://www.mnopedia.org/person/whipple-henry-benjamin-1822-1901#:~:text=Henry%20Benjamin%20Whipple%2C%20the%20first,Indian%20administration%20system.