There were many occasions in Winter War when Soviet forces was spotted that they were heavily on Vodka,attacking Finish defence lines.But there were usually also machine guns positioned behind the attacking force.Those Soviets sure knew how to motivate their troops.
About decision making.The Finnish commander in chief Marshall C.G.E Mannerheim still fallowed old Aristocratic dining etiquette.And i have read that through and the amount you have consumed alcohol during dining would put me personally pretty drunk before dinner time.