Promoted Field Marshal in 1792, he was appointed to raise and command the 3,873 man Hanoverian electoral contingent to the Holy Roman Empire. This force was absorbed into the general army mobilization at the end of 1792. Freytag commanded the Hanoverian troops and the 13–15,000 man Austro-Hanoverian corps under the Duke of York in the Flanders Campaign in 1793, seeing action at Rüme (St.Amand) 1 May, Famars 23rd, the siege of Valenciennes 13 June-28 July, and Cæsar's Camp 7/8 August. In the Siege of Dunkirk he commanded the left wing covering column. On 6 September he was driven back by Houchard at the Battle of Hondschoote, where he was wounded and captured, but rescued the following day by Wallmoden’s counter-attack. He resigned soon after due to poor relations with the Duke of York &amp; was replaced by Wallmoden.