Bill Walsh loved military history, including the Civil War. He had read all of the books he could find about it, and when Dad took the family to Gettysburg one year, he conducted a tour of the battlefield for us that was detailed to such a degree a paid tour guide could have learned something. He used his knowledge of military history to motivate teams and often invoked battles when, against all odds, the troops—i.e., his team—had overcome the enemy.