Dig through your Russian Books and tell me if the Soviet Bt-7A was used as SP-Arty firing indirect one source I saw (
https://www.tanks-encyclopedia.com/w...-Artillery.php ) didn't specially say they fired indirect but that the gun ..
Quote:
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"At its maximum elevation of 24 degrees, the gun could arc shells up to an effective range of 4,200 meters"
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.......and you don't (normally) see references to arcing shells 4,200 meters for direct LOS firing