He had sent articles to newspapers about organizing "Military readiness," many years before World War I broke out. In 1913 he wrote to the Fortnightly Review, expressing his views about new untested warfare: "These new factors are the submarine and the airship". He foresaw the possibility of a "Blockade" by enemy submersible ships, long before anyone in the British navy did. The only solution he added would be to build a Channel Tunnel. But this intelligent man's warnings were judged to be "Jules Verne fantasies" by most naval experts.
As soon as the war broke-out, Conan Doyle then fifty-five, offered to enlist again. He was denied his wish once more but set out to organize a civilian battalion of over a hundred volunteers. When the navy lost more than a thousand lives in a single day, his brilliant mind never at rest, Conan Doyle made suggestions to the War Office to provide "inflatable rubber belts," and "inflatable life boats." He also spoke of "body armor" to protect soldiers on the front.[/I] - very likely Ni+Te