The Castle Rhinehart Affair
Paul Kupperberg (writer), Jerry Grandenetti (artist)
Published in issued #17-18 of Men Of War with 12 color pages. Also reprinted in Showcase Presents: Men Of War in 2014.
The year is 1870. The location is Germany. Rosa takes a contract to kill Baron Rhinehart and finds that there are French spies trying to find out secrets. Will he still finish his mission anyway?