Towards the end of June, they again advanced to meet the force that Augustus had gathered, and on the 6th of July the Swedes arrived within a few miles of Clissow.  The next day some reinforcements arrived, and the king decided to give battle on the following day, which was the anniversary of the victory on the Dwina, the previous year.

His army was twelve thousand strong, while that of Augustus was nearly double that strength, and was very strongly posted, his camp being surrounded by morasses, although situated on rising ground which commanded the whole of the country round it.  The bogs in the front were found to be so impassable, that the Swedes were forced to make a circuit to the left, where the ground was firmer.  This movement obliged the enemy also to change front, a movement that caused considerable confusion, as they themselves were forced to traverse boggy ground, to take up a new position facing that by which the Swedes would now advance.

The attack was commenced by the division commanded by the Duke of Holstein, but, scarcely had he set his troops in motion than he was mortally wounded, by a ball from a falconet.  His troops, however, pushed forward vigorously.  The Polish division opposed to them resisted the two first assaults bravely, but gave way at the third attack, and were driven from the ground, in such confusion that they took no further part in the engagement.

While this was going on, the Saxon cavalry had been repulsed by that of Charles, and, passing in their retreat under the fire of three infantry regiments, suffered so heavily that they left the field.  The Swedish foot now advanced all along the line, and in the centre destroyed several battalions of Saxons.

But the Swedish right was attacked so vigorously by the Saxon left, under Field Marshal Steinau, that for a time the conflict was doubtful.  The Swedish horse guards and other cavalry, however, charged with such determination that the Saxon horse on this flank were also defeated, and driven off the field, while the Swedish infantry, advancing without firing, drove several battalions of Saxon foot into a village, where, being surrounded, almost all were killed or taken prisoners.

The Saxon horse, gathering once more, attempted bravely to retrieve the fate of the day, and engaged the Swedish horse with such desperate valour, that a considerable portion of the Saxon infantry were enabled, under cover of the conflict, to draw off, cross the morasses, and make their escape.

The battle lasted four hours, and had been, throughout, severely contested.  The Saxons lost four thousand killed and wounded, and three thousand taken prisoners, while the Swedes had eleven hundred killed and wounded.  Forty-eight cannon were captured by the victors, together with all the baggage and waggons.  The death of the Duke of Holstein, a gallant prince who was exceedingly popular with the army, and beloved by the king, cast a gloom over this great victory, which virtually laid Poland at the feet of the victors, and insured the fulfilment of the object for which Charles had persisted in the war.