Siege of Riga by the Russian Army under Tsar Alexei Mikhailovich was the main event of the Russo-Swedish War. The fortifications of Riga consisted of a wall with ditch and 5 bastions around the old town. In 1652 Swedes had started construction of a new wall with 12 bastions around suburbs, but by 1656 the work had not been completed. The Russian vanguard consisting of the Vladimir v. Vizin reiters, Daniel Krafert infantry and Iunkmann dragoons approached Riga on August 20 and threw back the Swedes under count of Pärnu, into the city. Von Thurn was either killed, or captured in the action. The Swedes evacuated the suburbs and withdrew to the old town. A few days later, the main army under Tsar Alexei Mikhailovich arrived on the ships on the Duna River, and laid siege to Riga. The Russian a