At the end of August 1756, when Frederick II proceeded to the invasion of Saxony, the regiment retired to Pirna with the rest of the Saxon army. At Pirna, the regiment was deployed on the left wing under von Harthausen, as part of von Gersdorf's Brigade. The Prussians blockaded the Saxon army in Pirna from September 9 until October 15 when the Saxons finally had to surrender. The regiment was then forcefully incorporated into the Prussian Army as Loen Fusiliers.
In 1757, the entire regiment absconded from the Prussian service. Led by sergeant Seher, the 1st battalion left the camp of Lübben on March 28, the 2nd battalion, commanded by sergeant Richter of the Königin regiment, departed from Guben on March 29. Both directed their escape to Meiseritz in Poland. Arriving there, both sergeants were instantly promoted to the rank of captain. The regiment marched to Hungary to join the other Saxon troops gathering there. Since these days, it beats the Grenadiermarsch. The newly reformed regiment was then incorporated into the Saxon Auxiliary Contingent.
In 1758, to avoid further contact with the Prussians, the contingent marched through southern Germany and had, by July, assembled in Strasbourg. On September 3, the regiment was part of the Saxon contingent, under the command of prince Xaver, who encamped at Castrop, 15 km from Recklinghausen, on his way to make a junction with the French army of the Marquis de Contades in Westphalia. This contingent made a junction with Contades' army around mid September. As part of Chevert's and Fitzjames' divisions, it reinforced the army of the Prince de Soubise in Hesse. On October 10, the contingent first saw action at the battle of Lutterberg where its determined attacks decided the day for the French army. On October 20, 10 days after their victorious action at the battle of Lutterberg, the Saxon regiments rejoined Contades at Werl.
On April 13 1759, the regiment took part in the battle of Bergen where it formed part of the first line of the left wing under the command of the baron de Dyherrn. In June, during the French offensive in West Germany, the regiment was part of the main army under the command of the Marquis de Contades where it was deployed in the second line of the infantry centre. On August 1, the regiment took part in the battle of Minden where it was deployed in the second line of the infantry left wing under the command of the comte de Lusace.