Nearly all 85 players in camp were involved in a squabble Saturday that began when offensive tackle Oniel Cousins and defensive tackle Amon Gordon threw punches after running back Allen Patrick was taken down hard on a burst up the middle. All the players surged toward the middle of the field, and it was nearly two minutes before peace was restored.

“Guys are competing, so tempers flare a little bit,” Harbaugh said. Later during practice, which was held indoors because of rain, defensive backs Corey Ivy and Frank Walker came to blows during a blocking drill.