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The iron plough greatly increased crop yields, leading to a population explosion. The number of commoners rose to outstrip the aristocracy’s ability to exercise control. Furthermore, iron technology led to a new generation of weapons, far cheaper and easier to make than the bronze weapons of earlier generations. Spears, pikes, battle axes, and knives could now be supplied to commoner infantry troops, and the role of aristocratic chariot warriors rapidly diminished. As populations grew, wars came increasingly to pit huge infantry armies of commoners against one another, in service of their kings. By the end of the Warring States period, million-man battles were being fought on the plains of eastern China. The political stakes had risen many-fold since the aristocratic heyday.