Two college football players battle it out outdoors on the field during game day, where one is the quarterback trying to throw the ball, and the other player is in action about to sack the quarterback.
A college football game.
The football players battling it out on the field so they were engaged in a football game.
Two college football players battle it out outdoors trying to throw the ball implies that there is a college football game.
Game day would imply there is a football game