 Opposition among the Salihiyyah to as-Salih rose when the latter ordered the assassination of his brother Abu Bakr al-Adil in 1249, a task which many of the Salihiyyah were affronted by and rejected; four of the Salihiyyah ultimately agreed to execute the controversial operation.Tensions between As-Salih Najm al-Din Ayyub and his mamluks came to a head later in 1249 when Louis IX of France's forces captured Damietta in their bid to conquer Egypt during the Seventh Crusade.As-Salih believed Damietta should not have been evacuated and was rumored to have threatened punitive action against the Damietta garrison.