ABSTRACT
The impact of Ultra intelligence upon the conduct of the Allied campaign in Italy and upon the battle for the Gothic Line in particular requires an examination of the nature and scope of Ultra intelligence itself as a preliminary. By 1944, it must at once be emphasised, Ultra was far and away the Allies’ most important source of information about the enemy, quite outstripping in regularity, volume and reliability anything learned from agents, line-crossers or prisoners of war.
