In the previous episode of the Social Science of War, our guests explored the strategic and political dynamics of NATO. This episode continues the focus on European security, turning specifically to the tactical and operational lessons on display in the war in Ukraine. It features a discussion with three expert guests: retired Lieutenant General Ben Hodges, the former commander of US Army Europe; Major Ryan Van Wie, a former assistant professor in West Point's Department of Social Sciences currently deployed as part of Operation European Assure, Deter, and Reinforce; and Dr. Jack Watling, senior research fellow for land warfare at the Royal United Services Institute. From mission command to logistics and from air defense to the synchronization of combined arms, our guests explore the tactical-level lessons emerging from Ukraine. They then turn to a discussion of the theory and practice of conventional deterrence, and how the United States can best posture its forces in Europe to deter future aggression.