Hitler would soon have cause to rue his decision regarding the fate of Carpatho-Ukraine. In six months, during his 1939 invasion of Poland, the common Polish-Hungarian border would become of major importance when Admiral Horthy's government, on the ground of long-standing Polish-Hungarian friendship, declined, as a matter of Hungarian honor, Hitler's request to transit German forces across Carpathian Rus into southeastern Poland to speed that country's conquest. The Hungarian refusal allowed the Polish government and tens of thousands of military personnel to escape into neighboring Hungary and Romania, and from there to France and French-mandated Syria to carry on operations as the third-strongest Allied belligerent after Britain and France. Also, for a time Polish and British intelligence agents and couriers, including Krystyna Skarbek, used Hungary's Carpathorus as a route across the Carpathian Mountains to and from Poland.