There are no such thing as an easy victory in war but after triumph in Tunisia, the sweeping success of the Sicilian invasion, and with the Italian surrender, the Allies were confident that they would be in Rome before Christmas 1943. And yet it didn’t happen. Hitler ordered his forces to dig in and fight for every yard, thus setting the stage for one of the grimmest and most attritional campaigns of the Second World War. By the start of 1944, the Allies found themselves coming up against the Gustav Line: a formidable barrier of wire, minefields, bunkers and booby traps, woven into a giant chain of mountains and river valleys that stretched the width of Italy where at its strongest point perched the Abbey of Monte Cassino. James Holland has drawn widely on diaries, letters and contemporary sources to write the definitive account of this brutal battle.