Kammala jumla mai zuwa: Longstreet ya ba da gudummawa mai yawa ga yawancin nasarorin Confederate masu mahimmanci, galibi a cikin Gidan wasan kwaikwayo na Gabas a matsayin ɗaya daga cikin manyan ma'aikatan Robert E. Lee a cikin Sojojin Arewacin Virginia. Bai yi kyau ba a
Bakwai Pines ta hanyar ba da gangan ba da mutanensa a kan hanyar da ba ta dace ba, wanda ya sa suka zo da wuri, amma ya taka muhimmiyar rawa a nasarar nasarar da aka yi a cikin yakin kwana bakwai a lokacin rani na 1862, inda ya taimaka wajen kula da hare-haren da aka yi a kai a kai wanda ya kori sojojin Union daga babban birnin tarayya na Richmond. Longstreet ya jagoranci wani mummunan hari wanda ya kori sojojin Union a karo na biyu na Bull Run a watan Agusta. Mutanensa sun riƙe matsayinsu a matsayin kariya a Antietam da Fredericksburg. Bai shiga cikin nasarar Confederate a Chancellorsville ba, kamar yadda shi da mafi yawan sojojinsa suka rabu da su a kan ƙananan Siege na Suffolk. Longstreet mafi yawan rikice-rikice ya kasance a yakin Gettysburg a watan Yulin 1863, inda ya fito fili ya saba da Janar Lee a kan dabarun da za a yi amfani da shi kuma ya kula da wasu hare-haren da ba a yi nasara ba a kan sojojin Union. Bayan haka, Longstreet, a kan bukatarsa, an aika da shi zuwa Yankin Yammacin Yamma don yin yaƙi a ƙarƙashin Braxton Bragg, inda sojojinsa suka kaddamar da mummunan hari a kan layin Union a Chickamauga wanda ya kawo ranar. Bayan haka, aikinsa a cikin umarni mai zaman kansa a lokacin yakin Knoxville ya haifar da rashin nasarar Confederate. Zamanin Longstreet a Yammacin Gidan wasan kwaikwayo ya kasance ta hanyar rawar da ya taka a cikin rikice-rikice da yawa tsakanin janar-janar na Confederate. Ba a gamsu da yin aiki a karkashin Bragg ba, Longstreet da mutanensa sun koma Lee. Ya umurci sojoji a lokacin yakin daji a 1864, inda ya ji rauni sosai ta hanyar wuta. Daga baya ya koma filin, yana aiki a ƙarƙashin Lee a Siege na Petersburg da Kamfen Appomattox.