As a result, he drew up a plan for a voyage of exploration, seeking to establish a sailing route between Kamchatka and Japan and northern China.
[2] The Russian ambassador, Semyon Vorontsov, wrote to Nikolai Mordvinov with the good news that he had recruited four British officers, Trevenen, Robin Crown, Samuel Marshall, and Frederick Thesiger.
The Russian blockade at Porkala was after 24 August 1789 under the command of Captain James Trevenen, who started the effort to break the Swedish hold on Barösund.
The Russian departure opened the safe coastal sea route to Swedish transports.
[2] At the Battle of Vyborg Bay on 4 July 1790, he acted as a commodore, but was fatally wounded by enemy fire and died on 9 August, aged 30.