Since the North Koreans' Russian-made T-34 tank disappeared from the battle, allied armor in Korea has had nothing much to contend with except mortar and small-arms fire. U.N. armored columns thrust boldly into enemy territory, without the infantry screens whichaccording to the bookare needed to put hostile antitank gunners out of action. Early this month, a U.S. tank force probing toward the Reds' "iron triangle" suddenly ran into killing antitank fire. Ordnance officers quickly identified the source: Russia's highly effective 57-mm. antitank gun.
The Russian gun, nicknamed "the Goose" by G.I.s because of its long (13 ft.) barrel, fires a...