Copenhagen Alliance Treaty of 1709

a treaty signed between Russia and Denmark on October 11 during the Northern War of 1700–21 to confirm a treaty of July 16, 1699, whose terms Denmark had refused to accept up until 1709.

After Russia’s victory in the battle of Poltava, however, Denmark concluded this new treaty, which was composed of a declarative preamble and ten items. Under the terms of the treaty, Denmark was obliged to conduct an offensive war against Sweden without subsidies, to help reinstate the Polish king August on his throne, to restore trade and free passage by sea to vessels of both of the undersigned countries, to win Prussia over to the side of the allies, and to act in accord with the allies in questions of foreign policy.