 The French assault columns were delayed by poor roads unsuitable for armoured vehicles, Việt Minh sabotage and the low-lying waterlogged terrain.The assault on Phú Yên is notable as a tank company of Mobile Group 1 discovered two Molotova trucks manufactured and supplied by the Soviet Union.This was the first proof of Soviet military assistance to the Viet Minh and by the end of the Indochina War, close to 800 Molotovas would be delivered to the Viet Minh.