Lithuania and the former army officers were angry about this. Also, the Bolshevik government had taken land from the Tsar and the nobles and given it to the peasants, and the civil war was supported by those landlords who had lost their land. All these enemies of the Bolsheviks co-operated to try to bring down the Bolshevik government. A second cause of the Civil War was the Czech Legion. These were some Czech prisoners of war being taken across Russia who in 1918 mutinied, took control of the Trans-Siberian Railway, and attacked towards Moscow. Finally, these groups within Russia were helped by the Great Powers, angry that Russia had dropped out of the First World War. They were afraid because the Bolsheviks believed in World Revolution, the Bolsheviks set up the Comintern, led by Zinoviev, which said it would cause communist revolutions all over the world. Consequently, the Allies sent armies to destroy the Bolsheviks, British, American and
Chinese plans to use its Air Force to attack Japanese troops. Instead the Japanese struck first, catching most of Chiang Kai-shek's Air Force at Hangchow. The Tokumu Han failed, however, to break two-part codes, such as the State Department's BROWN code, those used by the American Navy, and those introduced by Yardley into Chinese communications when he was Chiang's cryptologist—except in extraordinarily favorable circumstances. One such occurred on February 26, 1936, when two regiments mutinied in Tokyo and several statesmen were assassinated in an attempted coup d'etat. This furnished the cryptanalysts with an ocean of text and plenty of probable words to go fishing with. For a short time they read most American communications, including those of the naval attache. Then the United States changed systems, and the skill of the Tokumu Han again proved unequal to its task. Its resourcefulness made up for this: near the end of 1937, Morikawa, accompanied by a
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