The brother of the late Grand Duke Vasily III, suspected of duplicity by Vasily’s widow, the regent Yelena Glinskaya, flees Moscow for refuge at the court of Poland’s King Sigismund, but is intercepted and jailed for treason.

Sigismund, assembling a powerful army, wages inconclusive war with the Russians, who are able to quell insurrections fomented by the Poles and Lithuanians.

Grand Hetman Jerzy Radziwiłł and the Tatars devastate the area around Chernigov, …

…Novgorod Seversk, …

…Radogosca, …

…Starodub and …

…Bryansk in the summer of 1534.

A Muscovite army under the command of Prince Ovchina-Telepnev-Obolensky, Prince Nikita Obolensky, and Prince Vasily Shuisky invades Lithuania in October 1534, advancing as far as Vilnius and Navahrudak.

The Muscovite army builds a wooden fortress on the Lake Sebezh in 1535, before their advance is stopped by the Lithuanians.

The Lithuanian army under Hetman Radziwill, Andrei Nemirovich, Polish Hetman Jan Tarnowski, and Semen Belsky launches a powerful counterattack in 1535 and takes Homel and …

…Starodub.