Rubuta ci gaba don wannan sakin layi - Har zuwa wannan lokacin garin Massalia ya kiyaye 'yancin kansa kuma ya amfana daga kawancen da ya yi da Rome. Koyaya, a cikin 49 BC, lokacin da gwagwarmayar jagorancin Rome ta fara tsakanin Pompey Mai Girma da Julius Kaisar, shugabannin Massalia sun yanke shawarar yanke hukunci don tallafawa Pompey. (Duba Yaƙin Ƙasar Kaisar). Nan da nan Kaisar ya aika da rundunarsa zuwa Massalia kuma suka kewaye birnin. Ya gina dogon rami a kusa da garin, kamar yadda ya yi wa Gauls a Alesia
Kuma suka sare tsarkakakkun gandun daji na Ligures don gina hasumiyar kewaye. Ya kuma gina jiragen ruwa guda goma sha biyu a Arles da sabon rundunarsa, karkashin jagorancin magajinsa Decimus Junius Brutus Albinus, ya kayar da rundunar Massalian daga tsibirin tsibirin Frioul, kuma ya kewaye birnin daga teku. Cututtuka sun addabi mutanen. A watan Satumba na shekara ta 49 kafin haihuwar Yesu, sojojin wakilin Kaisar Trebonius sun keta ganuwar Massalia kuma sun kama shi. Massalians sun biya farashi mai yawa don tallafawa Pompey; garin ya rasa 'yancin kai, dole ne ya ba da jiragen yaƙinsa da baitulmalin sa, kuma an tilasta masa barin duk yankunanta a gabar teku da ciki, ban da tsibirin Stoechades da Nice.