However, the relationship between the two eventually deteriorated. Following a series of stunning victories by Kassa, Ali II was decisively defeated by his son-in-law "Dejazmach" Kassa (who later assumed the throne name of Tewodros II) in the Battle of Ayshal on 29 June 1853, and he lost both the regentship and his territories. At first, Ali fled to safety at a local church, then a few days later fled to the territories of his kinsmen in Wollo province, where he disappeared to history. Both Proutky and Trimingham give the date of 1866 for his death, without further details.