Ted Yeatman in his work "Frank and Jesse James, The Story behind the legend" in his notes to page 72-76 in particular on page 396 note 32.
"See Patrick Brophy's letter and map sent to Ted Yeatman Oct 31, 1994, concerning 3rd Wisconsin posts in Vernon County....New Company F (the same as old Company F) was stationed at Fort Insley probably at Douglas Ford on the Marmiton River northeast of the present community of Deerfield. New Company H ( Old Company C) was at Fort McKean, Kansas right along the state line on the West Fork Drywood Creek. New Company I (Old Company D) was at Fort Hamer probably at Lambert Ford of Drywood Creek due north of where creek crosses the present County Route HH. New Company K was at Fort Curtis at the site of old Balltown in 1865, southest of the present community of Metz...."
This 1873 map has most of the places named on it:
http://www.historicmapworks.com/Map/US/40845/Barton++St+Clair++Cedar++Bates+and+Vernon+Counties/
FWIW
John R