The Bears (2-4) blew a 14-point lead in the second half before coming through in overtime behind Howard, whose 53-yard run put Chicago at the Baltimore 40. After rookie Mitchell Trubisky completed an 18-yard pass to Kendall Wright, Barth delivered the game winner.
Making his first career start on the road, Trubisky directed a conservative game plan that leaned heavily on the run. The first-round draft pick completed 8 of 16 passes for 113 yards and a touchdown.
Bobby Rainey took a kickoff 96 yards for a score to begin the comeback and Michael Campanaro brought back a punt 77 yards for a touchdown with 1:37 remaining.