 This strategy worked, as the Qin offensives could not effectively penetrate the well-entrenched Zhao positions for over a year.Logistically strained, the Qin army attempted to engage in pitched battles, but Lian Po consistently refused to meet them in open battles.At this point, both sides increased the size of their forces at Changping, with the Zhao numbering 450,000 and the Qin numbering 550,000.