After the Soviet invasion of Poland Polish detachments retreated to the west, were forced to cross the frontier and found themselves in Lithuania and Latvia. After laying down their arms and registration, the Polish officers and soldiers were interned. In the wake of the Soviet invasion of Finland the Polish government-in-exile wished to assist the heroic nation. One of the proposed ideas envisaged dispatching the men interned in the Baltic countries. The Staff of the Commander-in-Chief proposed to create an expedition corps and a voluntary air force formation. After evacuation the volunteers would make their way to Sweden and then to Finland. Political obstacles hampered an efficient evacuation, and to the end of 1939 it involved only 500 persons. Once the Soviet-Finnish war came to an end, the project was abandoned. A year later, after the signing of the Sikorski-Mayski agreement, Polish soldiers interned in Latvia and Lithuania joined the Polish Army under General Wladyslaw Anders in the Soviet Union.
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