On 13 May 1938, while he rode his motorcycle down the streets of Tokyo, a very-intoxicated Sorge crashed into a wall and was badly injured. As Sorge was carrying around notes given to him by Ozaki at the time, if the police had discovered the documents, his cover would have been blown. However, a member of his spy ring managed to get to the hospital to remove the documents before the police arrived. In 1938, Sorge reported to Moscow that the Battle of Lake Khasan had been caused by overzealous officers in the Kwantung Army and that there were no plans in Tokyo for a general war against the Soviet Union. Unaware that his friend Berzin had been shot as a "Trotskyite" in July 1938, Sorge sent him a letter in October 1938: