Everything you think you know about war is wrong.

War is timeless. Some things change - weapons, tactics, leadership - but our desire to go into battle does not. We are in the midst of an age of conflict: global terrorism, Russias resurgence and Chinas rise, international criminal empires, climate change and dwindling natural resources.

The stakes are high, and we are dangerously unprepared.

As a former paratrooper and military contractor, Sean McFate has been on the front lines of deep state conflicts. He has seen firsthand the horrors of battle and as a strategist, understands...