Book excerpt: In an increasingly urbanized world, urban terrain has become a greater factor in military operations. Simultaneously, advances in military technology have given military forces sharply increased capabilities. The conflict comes from how urban terrain can negate or degrade many of those increased capabilities. What happens when advanced weapons are used in a close-range urban fight with an abundance of cover? Storming the City explores these issues by analyzing the performance of the US Army and US Marine Corps in urban combat in four major urban battles of the mid-twentieth century (Aachen 1944, Manila 1945, Seoul 1950, and Hue 1968). Alec Wahlman assesses each battle using a similar framework of capability categories, and separate chapters address urban warfare in American military thought. In the four battles, across a wide range of conditions, American forces were ultimately successful in capturing each city because of two factors: transferable competence and battlefield adaptation. The preparations US forces made for warfare writ large proved generally applicable to urban warfare. Battlefield adaptation, a strong suit of American forces, filled in where those overall preparations for combat needed fine tuning. From World War Two to Vietnam, however, there was a gradual reduction in tactical performance in the four battles.