Under the terms of the agreement and the secret protocol thereto, Sweden provided a mercenary corps, paid for by Russia, in exchange for the Korela Fortress with a county. In 1609–1610, the Swedish auxiliary corps under the command of Jacob Delagardi participated in battles against the supporters of False Dmitry II and the Polish interventionists. After the overthrow of Shuisky, Delagardi, under the pretext of non-fulfillment by the Russians of the terms of the treaty, in 1610–1613 captured Novgorod and a number of other northern Russian cities, further drawing Sweden into the Russian Troubles. The government of Mikhail Romanov during the years 1614–1617 held negotiations to end the occupation, but the Swedes insisted on territorial concessions. The negotiations were held in the midst of repeatedly renewed hostilities and culminated in the signing of the Treaty of Stolbovo.