Until mid-March 1939, Germany had considered a restored Hungarian-Polish frontier, for military reasons, undesirable. In March 1939, however, in response to Hungary's lobbying, Hitler changed his mind about a common Hungarian-Polish frontier and decided instead to betray Germany's ally, the Organization of Ukrainian Nationalists, who had begun organizing Ukrainian military units in 1938 in a "sich" outside Uzhhorod, the capital of Subcarpathian Rus', which had been restyled Carpatho-Ukraine. Hitler had been concerned that if a Ukrainian army, organized there, accompanied German forces invading the Soviet Union, Ukrainian nationalists would insist on an independent Ukraine. Polish political and military authorities, for their part, had seen the "sich" as an imminent danger to adjacent southeastern Poland, with its majority-Ukrainian population, and in November 1938 had launched paramilitary operations to assist Hungary in taking over the region, which Hungary had governed to the end of World War I. Consequently, in March 1939, Hungary took over the remainder of Carpathian Ruthenia.