Book excerpt: "During World War II, the US Army and its allies faced a formidable challenge: the need to assault Hitler's "Fortress Empire" from the sea. In order to win and hold a contested beachhead in the face of bitter enemy resistance, the US Army's amphibious-warfare specialists, notably combat engineers, played a variety of essential battlefield roles; if the US troops could not establish and consolidate a beachhead quickly, they risked being thrown back into the sea. For their part, the Germans had to design practical defensive tactics that made the most of their limited resources, the troops available, and the nature of the terrain. The German infantry defenders immediately around the landing areas had to be able to call upon support from nearby artillery, mechanized troops, and armored forces to have a chance of containing the enemy beachhead. This illustrated study analyzes the essential roles played by combat engineers involved in three key battles - the Allied amphibious landings at Salerno and Anzio in Italy, and Omaha Beach in Normandy - and their German opponents, whose combat experience and effectiveness varied considerably."--