In the summer of 1806 , during the War Hostile_encounter of the Third Coalition ( of Britain , Russia , Prussia , Sweden ) , Napoleon 's ambassador General Count Sebastiani managed to convince Convincing the Porte to cancel Change_event_time all special privileges granted Preventing_or_letting to Russia in 1805 and to open Process_start the Ottoman straits ( Dardanelles ) exclusively to French warships .

During the Dardanelles Operation Military_operation in September 1806 , Britain pressured Convincing Sultan Selim III to expel Extradition Sebastiani , declare Expressing_publicly war Hostile_encounter on France , cede the Danubian Principalities to Russia , and surrender Surrendering the Ottoman fleet , together with the forts on the Dardanelles , to the Royal Navy .

But the Turks erected Building powerful batteries and strengthened Cause_change_of_strength their fortifications with the help Assistance of General Sebastiani and French engineers .

In 1806 , the French envoy Sebastiani had been dispatched Sending to Constantinople with orders to bring about Causation Turkey 's re-entry Arriving into the Napoleonic Wars Hostile_encounter .

Sultan Selim III set about Process_start preparations for war Hostile_encounter with Russia after positively receiving Receiving Sebastiani .

In the meantime , the British ambassador to Constantinople , Arbuthnot , demanded Request that the Ottoman government evict Sebastiani , and added Cause_to_be_included that should the Ottomans resist Defending the ultimatum , the Mediterranean fleet would attack Attack .