A lokacin rani na 1208 sabon Sarkin Bulgeriya Boril wanda ya ci gaba da yakin magabacinsa Kaloyan da Daular Latin ya mamaye Gabashin Thrace.Sarkin Latin Henry Henry ya tara sojoji a Selymbria ya nufi Adrianople.Bayan labarin tattakin 'Yan Salibiyya, 'yan Bulgaria sun ja da baya zuwa wurare mafi kyau a yankin Beroia (Stara Zagora).Da daddare suka aika da ’yan kabilar Rumawa da ganima zuwa arewacin tsaunin Balkan, suka tafi cikin shirin yaki zuwa sansanin Latin, wanda ba shi da kagara.Da gari ya waye, sai suka kai hari kwatsam, sai sojojin da ke bakin aiki suka yi ta gwabza kazamin fada don samun wani lokaci domin sauran su shirya domin yaki.A yayin da 'yan kabilar Latin ke ci gaba da kafa rundunarsu, sun sha wahala sosai, musamman ta hannun maharba da ƙwararrun ƙwararrun maharba na Bulgaria, waɗanda suka harbe waɗanda har yanzu ba su da makamansu.A halin da ake ciki sojojin dawakan Bulgeriya sun yi nasarar zagaya sassan yankin Latin inda suka kai farmaki kan manyan sojojinsu.A yakin da aka yi, 'yan Salibiyya sun rasa mazaje da yawa kuma Sarkin sarakuna da kansa ya yi la'akari, da kyar ya tsere daga bauta - wani jarumi ya yi nasarar yanke igiya da takobinsa kuma ya kare Henry daga kiban Bulgaria tare da manyan makamai.A ƙarshe 'yan Salibiyya, waɗanda sojojin dawakan Bulgaria suka tilasta musu, suka ja da baya suka koma Philippopolis (Plovdiv) a cikin yaƙi.An ci gaba da ja da baya har tsawon kwanaki goma sha biyu, inda 'yan Bulgaria suka bi sahu tare da tursasa abokan adawar nasu inda suka yi sanadin asarar rayuka musamman ga masu tsaron baya na Latin wanda manyan dakarun 'yan Salibiyya suka ceto sau da dama daga rugujewarsu.Duk da haka, a kusa da Plovdiv 'yan Salibiyya a karshe sun yarda da yakin.