Randy McMillan gained 114 yards and scored twice, leading the Colts to a 31-17 victory over the winless Buffalo Bills today, their first at the Hoosier Dome.

Rookie Greg Bell led Buffalo's rushing game with 144 yards on 29 carries. Quarterback Joe Dufek, making his first NFL start in place of injured Joe Ferguson, ran for one touchdown and passed for another to give the Bills (0-5) a 17-10 lead in the third period.

The Colts (2-3), ranked second in the NFL in rushing going into the game, were held to a net 15 yards -- six by McMillan -- on the ground in the first two periods. But they recovered to gain 173 of their total 188 in the second half.

"We were very concerned at halftime," Indianapolis Coach Frank Kush said. "We were very pathetic with our running game in the first half. We couldn't come off the ball. So we changed our blocking up front and decided to go right at them.

"We told them to explode off the ball in the second half. Some of our best plays are when we give the backs a straightaway shot."

A 24-yard run up the middle by McMillan and a 22-yard pass from Mike Pagel to Tracy Porter set up McMillan's first touchdown, a 10-yard run that tied the score at 17-17 at the end of the third quarter.

On the Colts' first possession of the final period, McMillan ran 31 yards for the go-ahead touchdown.

Indianapolis got a clinching touchdown three minutes later when safety Mark Kafentzis intercepted a pass by Dufek and returned it 59 yards.

Curtis Dickey, the Colts' leading rusher for the season, had seven yards in the first half but finished with 72.

Dufek finished with 15 completions in 35 attempts for 205 yards passing and three interceptions. Ferguson, who has a sprained ankle, had started in 107 games, tying him with Philadelphia's Ron Jaworski for the longest starting string among current NFL quarterbacks.

Dufek completed eight of 13 passes for 123 yards in the first half, including one of 54 yards to Byron Franklin at the Indianapolis 21 that set up the Bills' second-period touchdown. Five plays later, Dufek ran in from the 11 to give the Bills the lead.