At a time when industrialisation was reaping major advances in naval technology, one American strategist, Alfred Thayer Mahan, almost single-handedly brought the field of naval strategy up to date.

• 唐太宗李卫公问对的最大贡献，在于提出对孙子的新解，提供不同方向的思考，而且对于兴废得失、各兵家学说皆可从此学习。