Despite obsolescence brought on by new developments in artillery design, large numbers of 75s were still in use in 1939 (4,500 in the French Army alone), and they eventually found their way into a number of unlikely places. A substantial number had been delivered to Poland in 1919–20, together with infantry ordnance, in order to fight in the Polish-Soviet War. They were known as 75 mm armata wz.1897. In 1939 the Polish army had 1,374 of these guns, making it by far the most numerous artillery piece in Polish service.
Many were captured by Germany during the Fall of France in 1940, in addition to Polish guns captured in 1939. Over 3,500 were modified with a muzzle brake and mounted on a 5 cm Pak 38 carriage, now named 7.5 cm Pak 97/38 they were used by the Wehrmacht in 1942 as an emergency weapon against the Soviet Union's T-34 and KV tanks. Its relatively low velocity and a lack of modern armor-piercing ammunition limited its effectiveness as an anti-tank weapon. When the German 7.5 cm Pak 40 became available in sufficient numbers, most remaining Pak 97/38 pieces were returned to occupied France to reinforce the Atlantic Wall defenses or were supplied to Axis nations like Romania (PAK 97/38) and Hungary. Non-modified remainders were used as second-line and coastal artillery pieces under the German designation 7.5 cm FK 231(f) and 7,5 cm FK 97(p).[citation needed] The few 60 Mle 1897/33s captured by the Germans were given the designation 7.5 cm K232(f).
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