When you watch a football game on TV, you can easily see how games are won or lost
in the battle that takes place on the line of scrimmage. Offensive plays are designed to
protect the quarterback and/or to open up holes in the defense so that yardage can be
gained.
Defensive plays are designed to sack the quarterback or close holes that would allow
yardage to be gained. Quarterbacks and coaches get the credit for wins and blame for
losses but the battle is won or lost in the trenches.