630 and 631s, in two-seater configuration, were soon used to replace obsolete ANF Les Mureaux 113 used as night fighters, while single-seat fighter groups received a number of three seat Potez 63s to act as command aircraft, from which formations of single-seat fighters would be directed and co-ordinated by radio. In July 1938, the first fifteen Potez 630 aircraft participated in the Villacoublay Air Show. In May 1938, the Armée de l'Air (French Air Force) placed an order for 125 Potez 633 light bombers; additional orders had also being placed by Romania and Greece for 20 and 24 Potez 633s respectively. France cancelled its order for Potez 633s in the summer of 1938, but further orders for the 633 were placed by Romania (for 20 more aircraft, which had been part built under the French order), and from China, for nine. Deliveries to Romania started late in 1938, with the Greeks receiving their first aircraft in the spring of 1939. In August 1939, with the risk of war increasing the French government requisitioned 32 Potez 633s from the Greek and Romanian orders that were still in France awaiting delivery. By September 1938, the Potez 630 had begun to supplant the obsolete Bloch MB.200 bomber in the fighter direction role; however, the Potez 630's engines proved so troublesome in service that most units were rapidly re-equipped with the Potez 631 prior to the outbreak of the Second World War. By 1 April 1939, a total of 77 Potez 630 and 88 Potez 631 aircraft had been accepted by the French Air Force. The retirement of other obsolete French aircraft, such as the Morane-Saulnier M.S.225 and Dewoitine D.510, could be accommodated for by the increasing numbers of Potez 631s. Just prior to the outbreak of the Second World War, the French Air Force had 85 Potez 630s, 206 Potez 631s, 22 Potez 633s, 63 Potez 633s, and 5 Potez 63.11 aircraft. The Potez 633 aircraft that were exported to Greece and Romania saw greater service than their French counterparts despite their limited numbers. Greece had nine Potez 633s in service when Italy invaded Greece in October 1940. These were used for bombing attacks against Italian supply lines until shortage of spares forced their withdrawal. In June 1941, Romania joined Germany in the invasion of the Soviet Union. Two squadrons were equipped with the Potez 633 which were used to support the Romanian