建安二十四(sì )年(nián )正月,随夏侯渊迎(yíng )战刘备军于定军山(shān ),当夏(xià )侯渊战死,全军面临覆没之时,张郃代帅(shuài ),率(lǜ )部(bù )安全撤退。后(hòu )屯陈仓。曹丕称帝后(hòu ),升左将(jiāng )军,封鄚侯,奉(fèng )命从曹真击平(píng )安定胡(hú )羌(qiāng ),后(hòu )与(yǔ )夏侯尚围攻江陵。魏太和二年(nián )春,张颌随(suí )曹真西拒诸(zhū )葛亮,张郃领兵5万,与蜀(shǔ )军前锋(fēng )马(mǎ )谡战于街亭,先将蜀军围困,绝(jué )其汲道(dào ),使其(qí )饥渴(kě )魂(hún )乱,