When the Empire of Japan started the war against Western powers in 1941,
it had only a small number of air force units deployed on the Japanese
home islands in order to defend them. The Doolittle Raid on 18 April
1942 came as such a shock for the Japanese High Command that it caused
structural changes within the Japanese air defense system and speeded up
the introduction of new types of fighters. Much bigger threat for Japan
emerged in the mid of June 1944 when the first air raid of B-29 bombers
reached the Japanese home islands. Since that moment protecting Japanese
cities from the devastating blows carried out by the U.S. bombers became
the General Defense Command (Boei Soshirebu) main task.
Volume I describes the forming process of the Japanese air defense
system since the creation of the General Defense Command in July 1941,
throughout the structural changes within the following years,
preparations to counter the U.S. bomb raids until the air battles fought
between June and December 1944 in the defense of Japan. This part of the
book also includes descriptions of all major types of Japanese fighters
which were deployed in air defense units.