Selim III repelled the British fleet of John Thomas Duckworth with the help of Sebastiani .
Selim III lost several major encounters against Russia , and he was finally toppled by his Janissaries as he was trying to reform his army , and replaced by Mustafa IV .
Selim III repelled the British fleet of John Thomas Duckworth with the help of Sebastiani , but lost several major encounters against Russia , and he was finally toppled by his Janissaries as he was trying to reform his army , and replaced by Mustafa IV .