NORFOLK, Va. (AP) — Devon Johnson rushed for a career-high 198 yards with three touchdowns, Remi Watson added 102 yards and two more scores as Marshall defeated Old Dominion 56-14 on Saturday.

Johnson, a junior who was converted from tight end, had two touchdowns in the first quarter as the Thundering Herd (5-0, 1-0 Conference USA) bolted to a 28-0 lead. The Monarchs (3-3, 1-2) scored with 36 seconds left in the first quarter on a 21-yard pass from Taylor Heinicke to Zach Pascal. It was the first points Marshall allowed in the first quarter all year, making the Herds’ advantage 73-7.

In the second quarter Rakeem Cato, who completed 18 of 23 passes for 198 yards, had a pair of scoring tosses, 42 yards to Tommy Shuler and 6 yards to Deon-Tay McManus.

Marshall finished with 591 yards.

Ray Lawry, who had 131 yards on 16 carries, had a fourth-quarter 27-yard TD for the Monarchs.

Marshall will host Middle Tennessee at noon next Saturday. MTSU beat the Herd last season on the final play of the game.