Romania built or bought the updated version, the P.24. They used parts of the P.24 to build the IAR 80 and 81. The Polish Air Force was not to be underestimated, fought the two biggest air forces and armies in the world.
In 1940 they were not in use at all due to the sad fact that Poland alone has not been able to resist Nazi strike from three directions combined with Soviet and Slovakian attack (which was a Nazi sattelite at that time). Thus the Polish Air Force used these outdated planes in combat from September 1st, 1939 until October 6th, 1939, to be correct, which was the time when they were defending the skies over their home country. In 1940 they used already French and Brithish aircraft as they were already in Exile. By the way it is worth notice that this plane's ancestor, the P.7 was the first plane with an overall metal airframe ever introduced into service. Great job, rOEN911!
Nice to see the Poles getting some well deserved recognition. They had some of the best pilots out there, though their aircraft were outdated. It took me a moment to decide which type I was looking at, a P.11 or an older P.7. But that's most likely just a case of me needing to study the differences more.