Barbarians are back. These small, highly mobile, and stateless groups are no longer confined to the pages of history; they are a contemporary reality in groups such as the Taliban, Al-Qaeda, and ISIL. Return of the Barbarians re-examines the threat of violent non-state actors throughout history, revealing key lessons that are applicable today. From the Roman Empire and its barbarian challenge on the Danube and Rhine, Russia and the steppes to the nineteenth-century Comanches, Jakub J. Grygiel shows how these groups have presented peculiar, long-term problems that could rarely be solved with a finite war or clearly demarcated diplomacy. To succeed and survive, states were often forced to alter their own internal structure, giving greater power and responsibility to the communities most directly affected by the barbarian menace. Understanding the barbarian challenge, and strategies employed to confront it, offers new insights into the contemporary security threats facing the Western world.

In an era of high technology and instant communication, the role of geography in the formation of strategy and politics in international relations can be undervalued. But the mountains of Afghanistan and the scorching sand storms of Iraq have provided stark reminders that geographical realities continue to have a profound impact on the success of military campaigns. Here, political scientist Jakub J. Grygiel brings to light the importance of incorporating geography into grand strategy. He argues that states can increase and maintain their position of power by pursuing a geostrategy that focuses on control of resources and lines of communication.

Grygiel examines case studies of Venice, the Ottoman Empire, and China in the global fifteenth century--all great powers that faced a dramatic change in geopolitics when new routes and continents were discovered. The location of resources, the layout of trade networks, and the stability of state boundaries played a large role in the success or failure of these three powers. Grygiel asserts that, though many other aspects of foreign policy have changed throughout history, strategic response to geographical features remains one of the most salient factors in establishing and maintaining power in the international arena.

From the Baltic to the South China Sea, newly assertive authoritarian states sense an opportunity to resurrect old empires or build new ones at America's expense. Hoping that U.S. decline is real, nations such as Russia, Iran, and China are testing Washington's resolve by targeting vulnerable allies at the frontiers of American power. The Unquiet Frontier explains why the United States needs a new grand strategy that uses strong frontier alliance networks to raise the costs of military aggression in the new century. Jakub Grygiel and Wess Mitchell describe the aggressive methods rival nations are using to test U.S. power in strategically critical regions throughout the world. They show how rising and revisionist powers are putting pressure on our frontier allies--countries like Poland, Israel, and Taiwan--to gauge our leaders' commitment to upholding the U.S.-led global order. To cope with these dangerous dynamics, nervous U.S. allies are diversifying their national-security "menu cards" by beefing up their militaries or even aligning with their aggressors. Grygiel and Mitchell reveal how numerous would-be great powers use an arsenal of asymmetric techniques to probe and sift American strength across several regions simultaneously, and how rivals and allies alike are learning from America's management of increasingly interlinked global crises to hone effective strategies of their own. The Unquiet Frontier demonstrates why the United States must strengthen the international order that has provided greater benefits to the world than any in history.

Barbarians are back. These small, highly mobile, and stateless groups are no longer confined to the pages of history; they are a contemporary reality in groups such as the Taliban, Al-Qaeda, and ISIL. Return of the Barbarians re-examines the threat of violent non-state actors throughout history, revealing key lessons that are applicable today. From the Roman Empire and its barbarian challenge on the Danube and Rhine, Russia and the steppes to the nineteenth-century Comanches, Jakub J. Grygiel shows how these groups have presented peculiar, long-term problems that could rarely be solved with a finite war or clearly demarcated diplomacy. To succeed and survive, states were often forced to alter their own internal structure, giving greater power and responsibility to the communities most directly affected by the barbarian menace. Understanding the barbarian challenge, and strategies employed to confront it, offers new insights into the contemporary security threats facing the Western world.