Why do we fight? Why go to war? This series looks at 9 of history's biggest motivations and causes for conflict, and a final episode on the psychology of the individual and what drives people to risk life and limb by going to war.

In this first episode we look at the power of Ego, and how time and again it has propelled leaders, and the men and women who follow them, to cause nations and empires to rise and fall.

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