▁while ▁not ▁specifically ▁mentioned ▁in ▁the ▁sources , ▁it ▁is ▁reasonable ▁to ▁assume ▁that ▁Leg io ▁XIII ▁was ▁also ▁present ▁for ▁the ▁Battle ▁of ▁A lesia . ▁ ▁After ▁the ▁end ▁of ▁the ▁Gall ic ▁wars , ▁the ▁Roman ▁Senate ▁refused ▁Ca esar ▁his ▁second ▁cons ul ship , ▁ordered ▁ ▁him ▁to ▁give ▁up ▁his ▁commands , ▁and ▁demanded ▁he ▁return ▁to ▁Rome ▁to ▁face ▁pro sec ution . ▁For ced ▁to ▁choose ▁either ▁the ▁end ▁of ▁his ▁political ▁career ▁or ▁civil ▁war , ▁Ca esar ▁brought ▁Leg io ▁XIII ▁across ▁the ▁Rub icon ▁river ▁and ▁into ▁Italy . ▁The ▁leg ion ▁remained ▁faithful ▁to ▁Ca esar ▁during ▁the ▁resulting ▁civil ▁war ▁between ▁Ca esar ▁and ▁the ▁conserv ative ▁Opt im ates ▁fa ction ▁of ▁the ▁sen ate , ▁whose ▁leg ions ▁were ▁commanded ▁by ▁Pom pe y . ▁Leg io ▁XIII ▁was ▁active ▁throughout ▁the ▁entire ▁war , ▁fighting ▁at ▁D yr rh ach ium ▁( 4 8 ▁BC ) ▁and ▁Ph ars alus ▁( 4 8 ▁BC ). ▁After ▁the ▁decis ive ▁victory ▁over ▁Pom pe y ▁at ▁Ph ars alus , ▁the ▁leg ion ▁was ▁to ▁be ▁dis band ed , ▁and ▁the ▁leg ion aries ▁" p ension ed ▁off " ▁with ▁the ▁traditional ▁land ▁gr ants ; ▁however , ▁the ▁leg ion ▁was ▁re called ▁for ▁the ▁Battle ▁of ▁Th aps us ▁( 4 6 ▁BC ) ▁and ▁the ▁final ▁Battle ▁of ▁M unda ▁( 4 5 ▁BC ). ▁ ▁After ▁M unda , ▁Ca esar ▁dis