1570 On August 21, Magnus approached Reval and began the
siege of the city. The number of his troops, according to the chronicle of
Balthasar Russow, was 25,000, which is accepted by some researchers as the real number of his troops, with an adjustment to 20,000. Some researchers consider these figures to be clearly overestimated, referring to the fact that only a few
Voivode's went on a campaign at the local level. Russian sources also do not mention a significant concentration of forces or preparations for the campaign, as was the case with the
siege of Polotsk. The numbers range from 1,000 to 4,500. It was wholly inadequate for a siege, however, Magnus believed that he could persuade the defenders to surrender. The Swedes only had around 650–785 knights. Their total strength was around 4-5,000 men. They demanded that the defenders capitulate, threatening severe punishment to those who resisted. They demanded that the city surrender to the Tsar's "vassal" and promised to open all parts of Russia to the merchants inside to trade freely. Their demands were rejected, and instead of attacking the city, they plundered and burned the villages outside of the city walls. After this, Magnus realized that the actions of the Oprichnina would make him lose support among Livonian nobles, and his attempt to reason with his allies turned into a strong clash with the voevody. In the ensuing argument, the Tsar supported Magnus, and Ivan and Vasilii were quickly arrested and sent back to Moscow in irons. The detaining of Ivan and Vasilii caused the immediate and complete suspension of the Russian siege works, during this period, Magnus informed the defenders that he "had no intention of lifting the siege and was only waiting for the arrival of Prince Yurii [Tokmakov] with a huge force and artillery."
1571 On 2 January, Tokmakovs forced arrived outside of Reval, the freezing weather had made constructing siege works more difficult for the besiegers. The Voevody was not able to get the cannons close enough to the city walls and a month and a half of bombarding them did not yield desirable results. In early February, a letter is thrown into the city, it told the defenders that peace with Denmark had been signed. In celebration of this news, the defenders do a successful sortie against the besiegers. After a plague had spread to the Russian camp, and in order to escape from it, the voevody decided to lift the siege, and on 16 March Tokmakov withdrew back to Pskov, with Magnus also burning his camp and retreating. casualties for the Russians per Swedish and Livonian sources. Some sources believe this number is exaggerated.
Battle of Ubagall When the defenders saw that the Russians have retreated fully, Carl Henriksson Horn decided to commit to a counterattack with 300 knights. In the village of Ubagall, close to Weissenstein, Carl surprised the Russian force under the command of a certain Tiesenhusen. As a result, the entire Russian force was killed, and most of the Russian supplies were taken. == Aftermath ==