Why did this war that was supposed to be "over by Christmas" descend into four years of millions of men living in trenches on the Western Front and in other parts of the globe? How were thousands of miles of trenches constructed under the threat of enemy fire? How did men eke out their daily existence amid the mud and grime? Were there differences between the German and British trench lines? Answering all these questions and many more, this easy-to-read guide will tell you everything you need to know.