Polish soldiers, some injured in combat during the German-Soviet invasion cross the Romanian Bridgehead in retreat. The Romanian Bridgehead was an area in southeastern Poland, presently located in Ukraine. On 14 September 1939, Polish troops fighting east of the Vistula were ordered to withdraw towards the city of Lwów (Lviv), then to the hills along the borders of Romania and the Soviet Union. Poland and Romania had been allied since 1921 and the defensive pact was still valid in 1939, before Romania joined the Axis powers. The Soviet Union then invaded Poland from the east in early hours of 17 September, breaking the non-aggression pact with Poland, while Poland’s ally France, despite promises, had taken no significant action against Germany, making it impossible for the Polish Army to hold out at least in eastern parts of the country. In the late hours of that day, the Polish government and members of the military high command crossed the Polish-Romanian border with intention to move to France where Polish forces in the West were being formed. Polish units were ordered to evacuate Poland and reorganize in France. Near Hotin, Hotin County, Romania (now, Khotyn, Chernivtsi Oblast, Ukraine). September 1939.