In the summer of 1806, during the War of the Third Coalition (of Britain, Russia, Prussia, Sweden), Napoleon's ambassador General Count Sebastiani managed to convince the Porte to cancel all special privileges granted to Russia in 1805 and to open the Turkish straits (Dardanelles) exclusively to French warships. In return, Napoleon promised to help the Sultan suppress a rebellion in Serbia and to recover lost Ottoman territories. When the Russian army marched into Moldavia and Wallachia in 1806, the Ottomans declared war on Russia.