Greg Bell ran for two touchdowns to key the Buffalo Bills' first victory of the season, a 21-9 decision today over the Indianapolis Colts.

The Bills (1-6) ended an eight-game losing streak. The last NFL victory for the Bills, who had lost 25 of their preceding 30 games, came Dec. 2 against Indianapolis.

Bell, teaming in the backfield for the first time with former All-Pro Joe Cribbs, gave Buffalo a 7-0 lead at 4:09 of the opening quarter, scoring on a seven-yard run around the right side. Cribbs returned to the Bills Oct. 11 after two years in the U.S. Football League.

Raul Allegre's 41-yard field goal brought the Colts (2-5) within 7-3. Allegre kicked a 27-yarder at 10:09 of the second quarter to make it 7-6. Bell, after catching a pass at the Colts' one, went over with 17 seconds left in the half to push Buffalo's lead to 14-6.

After Vince Ferragamo's pass for Cribbs was intercepted by rookie safety Anthony Young at the Buffalo 39, Allegre made it 14-9 with a 38-yard field goal at 4:21 of the third quarter.

Early in the fourth quarter, Dean Prater blocked a punt by Rohn Stark, and Ferragamo threw to tight end Pete Metzelaars on the next play for a three-yard touchdown. Stark, in his fourth NFL season, had not had a punt blocked in college or as a pro.