A Prussian counter-attack of Swedish Pomerania in January 1760 was repelled, and throughout the year Swedish forces again advanced into Prussian territory as far south as Prenzlau before again withdrawing to Swedish Pomerania in the winter. Another Swedish campaign into Prussia started in the summer of 1761, but was soon aborted due to shortage of supplies and equipment. The final encounters of the war took place in the winter of 1761/62 near Malchin and Neukalen in Mecklenburg, just across the Swedish Pomeranian border, before the parties agreed on the Truce of Ribnitz on 7 April 1762. When on 5 May a Russo-Prussian alliance eliminated Swedish hopes for future Russian assistance, and instead posed the threat of a Russian intervention on the Prussian side, Sweden was forced to make peace.