Rubuta ci gaba don wannan sakin layi - Paparoma a kai a kai yana ba da gata na yaƙin basasa daga 1360s ba tare da samar da wata babbar amsa ta soja ba game da Musulmai a Bahar Rum. Farkon farfadowar aiki shine shirin Genoese na 1390 don kwace tashar jiragen ruwa ta Tunisiya ta Al-Mahdiya. Dukansu Roman da Avignon popes bayar indulgences da Faransa sarki kawun, Louis II, Duke na Bourbon, shi ne shugaban. Akwai 'yan shaidar da ake yi na gicciye, kuma aikin ya kasance mafi yawan tafiya ta hanyar tafiya ta hanyar karamin karfi. Bayan makonni tara da aka kewaye Tunis da cututtuka, yakin basasa
sun amince su janye. Bayan nasarar da suka yi a yakin Kosovo a 1389, Ottomans sun ci nasara da yawancin Balkans kuma sun rage tasirin Byzantine zuwa yankin da ke kewaye da Constantinople, wanda daga baya suka kewaye shi. A cikin 1393, Tsar Bulgarian Ivan Shishman ya rasa Nicopolis ga Ottomans. A shekara ta 1394 Paparoma Boniface IX ya sanar da sabon Yaƙin Crusade da Turkawa, ko da yake rabuwa ta Yamma ta raba papacy. Sigismund na Luxemburg, Sarkin Hungary, ya jagoranci wannan Crusade wanda ya hada da wasu manyan Faransawa ciki har da John the Fearless, dan Duke na Burgundy, wanda ya zama shugaban soja na Crusade. Sigismund ya shawarci 'yan Salibiyya su mai da hankali kan tsaro lokacin da suka isa Danube, amma sun kewaye birnin Nicopolis. Ottomans sun ci su a cikin Yaƙin Nicopolis a ranar 25 ga Satumba, sun kama fursunoni 3,000.