Brock caught a 7-yard touchdown pass from Robertson and rushed for a 22-yard score as the Black Bears shot out to a 17-0 halftime lead before making it 24-0 on Robertson's 35-yard TD pass to Devin Young.
Jonny Messina added a pair of field goals for the Black Bears (2-4, 1-3 Colonial Athletic Association).
The Black Bears rolled up for 417 yards offense with Robertson throwing for 223. They gave up 388 to the Tribe (4-2, 2-1), who had 258 on the ground, but William & Mary had two passes intercepted and lost a fumble.
Darius Wilson threw for a 76-yard touchdown to Zach Burdick but had the two interceptions. Donavyn Lester ran for 112 yards on 13 carries. Wilson's 1-yard run late in the third quarter provided the Tribe's other points.
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