Britannica Educational Publishing 
War on Land [PDF ebook] 

Long before they took to the sea and air, warring factions engaged in land-based conflicts that involved close-range combat with rudimentary defenses and weapons. As civilizations have advanced, so too have their military strategies, tactics, and weaponry. Eventually this led to the development of sophisticated land fortifications, arms, artillery, and missile systems in use today by ground troops. This insightful volume examines the evolution of warfare on land around the world, as well as the impact of new technologies on the nature of war.