In this book, Tim Dee tells the story of four green fields spread around the world: their grasses, their hedges, their birds, their skies, and both their natural and human histories. These four fields--walkable, mappable, man-made, mowable, knowable, but also secretive, mysterious, wild, contested, and changing--play central roles in the sweeping panorama of world history and in the lives of individuals. In Dee's telling, a field is never just a setting for great battles or natural disasters, though it is often this as well. A field is the oldest and simplest and truest measure of what a man...