Sifen farko na Krujë ya faru ne a shekara ta 1450 lokacin da sojojin Ottoman mai kusan mutane 100,000 suka kewaye garin Krujë na Albaniya.Ƙungiyar Lezhë, wadda Skanderbeg ke jagoranta, ta fuskanci ƙarancin ɗabi'a bayan ta rasa Svetigrad da Berat a tsakanin 1448 zuwa 1450. Duk da haka, gargaɗin Skanderbeg da goyon bayan limamai, waɗanda suka yi da'awar cewa sun sami wahayi na mala'iku da nasara, sun motsa Albaniyawa don kare kansu. babban birnin League, Krujë, a kowane farashi.Bayan ya bar sansanin tsaro na mazaje 4,000 a karkashin amintaccen Laftanarsa Vrana Konti (wanda aka fi sani da Kont Urani), Skanderbeg ya tursasa sansanonin Ottoman da ke kusa da Krujë kuma ya kai hari kan ayarin motocin Sultan Murad II.A watan Satumba sansanin Ottoman ya kasance cikin rudani yayin da hankali ya kwanta kuma cututtuka suka yi kamari.Dakarun Ottoman sun yarda cewa babban ginin na Krujë ba zai fado da karfin makamai ba, ya ɗaga kewayen, kuma ya yi hanyar zuwa Edirne.Ba da daɗewa ba, a cikin hunturu na 1450-51, Murad ya mutu a Edirne kuma ɗansa, Mehmed II ya gaje shi.