 On March 27, the Russians received word about the earlier disastrous defeat at Wschowa. Peter I realized that the chances of a combined attack on Charles were now minimal. He ordered Ogilvy to attempt an escape from the encirclement at Grodno and a retreat towards Brest-Litovsk. Ogilvy carried out the order on April 4 and managed to break out unseen with his reduced army, leaving 8,000 men behind at Grodno who had died of starvation and sickness. Another 9,000 men were lost during the retreat as the Swedes pursued the Russians as far as Polesia, where they finally gave up the chase. Mazepa met a similar defeat, as he sent 4,700 men in an attempt to save the Cossacks trapped inside Lyakhavichy. Instead these were annihilated in the battle of Kletsk on April 30, after which the garrison in Lyakhavichy surrendered to the Swedes on May 12 and the fortress was destroyed. In total, almost 10,000 Cossacks were killed, out of the initial 14,000 who actively participated in the campaign.
