September 27
Politics, Germany
Adolf Hitler's senior commanders are told of his plans for a western offensive at the earliest opportunity. This announcement is met with hostility by the military, who resent Hitler assuming direct control over strategic planning and also feel unprepared for this undertaking. His plan for invading the Low Countries, formulated as Plan Yellow on October 19, is constantly aborted due to bad weather. The plan is also modified and its objectives widened before the actual offensive in 1940.

September 29
Politics, Soviet Union
After occupying Poland, the Soviet Union concentrates on extending its control over the Baltic Sea region to safeguard against any German threat. During the next few weeks it gains bases and signs 'mutual assistance' agreements with Lithuania, Latvia, and Estonia. Finland, however, will not agree to the Soviet Union's territorial demands and mobilizes its armed forces in October as political dialogue fails to resolve the crisis.

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