Determined to learn from the lessons of World War I where it was unprepared and heavily reliant on British and French guns, the US Army developed a new generation of field artillery weapons and tactics during the 1930s. Consequently, in World War II it was the clear leader in field artillery. Providing a thorough examination of the many critical innovations and doctrines, and the impact they had on performance in combat, this book demonstrates why US field artillery was so effective in World War II. Innovations featured include the motorization of artillery, which increased mobility; fire direction centres, which enhanced their firepower; aerial observation; and radio communications. Exploring, in their entirety, the weapons that formed the backbone of the US artillery arsenal in World War II, this book reveals a wealth of detail not readily available elsewhere.