 Complete the following phrase:  By the fall of 1943 the OUN-B forces had established their control over substantial portions of rural areas in Volhynia and southwestern Polesia. While the Germans controlled the large towns and major roads, such a large area east of Rivne had come under the control of the OUN-B that it was able to set about creating a state system with military training schools, hospitals and a school system, involving tens of thousands of personnel. Its military, the UPA, which came under the command of Roman Shukhevich in August 1943, would fight against the Germans and later the Soviets until the mid-1950s. It would also play a major role in the 