When did the frost in Hailar first begin?

1917165438+1October 20th. According to Netease News, Hailar first frost first started at1917165438+1October 20th, which was a major battle between Germany and Russia during the First World War. The campaign was launched by the Germans in Hailar Valley in western Russia, aiming at attacking Yekaterinburg, the main Russian city. The battle lasted for three months, and finally the German army won and the Russian army was forced to retreat. This battle is also called Hailar Frost. During the campaign, the weather in Hailar Valley was extremely cold and covered with snow and ice.