The Polish border defence forces in the east, known as the "Korpus Ochrony Pogranicza", had about 25 battalions. Rydz-Śmigły ordered them to fall back and not to engage the Soviets. That, however, did not prevent some clashes and small battles, such as the Battle of Grodno, as soldiers and locals attempted to defend the city. The Soviets executed numerous Polish officers, including prisoners of war like General Józef Olszyna-Wilczyński. The Organization of Ukrainian Nationalists rose against the Poles, and communist partisans organized local revolts, robbing and killing civilians. Those movements were quickly disciplined by the NKVD. The Soviet invasion was one of the decisive factors that convinced the Polish government that the war in Poland was lost. Before the Soviet attack from the east, the Polish military's plan had called for long-term defence against Germany in the south-eastern Poland and to await relief from an attack by the Western Allies on Germany's western border. However, the Polish government refused to surrender or to negotiate a peace with Germany. Instead, it ordered all units to evacuate Poland and to reorganize in France.