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The Border Protection Corps is established in the Second Polish Republic for the defence of the eastern border against armed Soviet raids and local bandits.

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Border Protection Corps
Polish military division on the USSR border (1924–39)
The Border Protection Corps was a military formation of the Second Polish Republic that was created in 1924 to defend the country's eastern borders against armed Soviet incursions and local bandits. Other borders were under the jurisdiction of a separate, regular Border Guard…Source: Wikipedia (CC BY-SA)