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Below I present how the evolution of air attacks took place from 1917 to 1944, first with bombers equipped with torpedoes and then with planes equipped with free-fall bombs. But I also present the evolution of defensive methods developed by sailors before World War II to protect themselves against air attacks. This video and others can be found on my website www.victoraguilarchang.com and my books can be purchased on Amazon. I hope you like it. Sincerely, Victor Aguilar-Chang