(St. Paul, MN) --  A North Branch man has been sentenced to two years in prison for ramming into the vehicles of two U.S. Marshals last October.  Due to probation violations from a prior federal offense, an arrest warrant had been issued for 27-year-old Shawn Olthoff.  When officers tried apprehending Olthoff in North Branch, he fled the scene in his girlfriend's car, striking the Marshal's vehicles and a number of other vehicles -- before fleeing on foot.  Olthoff was arrested the following day.