In 1932 in Jiangxi Soviet Area, the Kuomintang on the Soviet siege cause material extremely scarce, the Red Army to break through the enemy blockade, in Gan county set up the Red Army customs and Trade Bureau, this has become an important pillar of the Soviet government. The Kuomintang spy Kozawa, strangling the economy in the Soviet Region formulated the "iron array plan, overnight, arresting and the Reds tungsten trade dealings in the firm's boss, destroying the and the Reds trade point of contact, seized a large number of tungsten and the important material, also raided the customs of the Red Army. Emergency, Renyuan, head of the Red Army from the front arrived Ganxian, tit for tat stepped in, and the enemy spy agencies, reconstruction of the Red Army customs, found spy, reopen wolfram trading, breaking the enemy strangling the economy in the Soviet region of iron matrix! Renyuan selected a group of young male and female Red Army soldier action group, they have a firm belief, extraordinary skill and different personality. Under the leadership of Renyuan interspersed in the Soviet and white interval to deal with at the local warlords, Central Executive Committee of the Kuomintang army spy, the foreign Matheson, merchants and other groups, and enemy battle of wits bucket Yong, paid a great sacrifice, finally defeated the enemy, breaking the "iron matrix.