After the Battle of Klushino, the Swedish troops, located in Russia, called in 1609 by Vasily Shuisky, declared war on Russia and in 1611 occupied Novgorod land. The siege of Tikhvin in 1613 was unsuccessful for the Swedes, but in 1614 they managed to take Gdov. In 1615 the Swedish King Gustavus Adolphus intended to subdue the Pskov land.