On 20 March , the combined troops of Hanover and Celle penetrated into the Duchy of Braunschweig, disarmed part of the troops of the duchy and blockaded the city of Braunschweig. The mediation of Great Britain and Brandenburg allowed to settle the dispute. In the meantime, the first regiment was allocated to Hanover, and the second to Celle. Initially, the two principalities refused to cede these regiments to the emperor.
The new regiment counted approx. At his death, on 2 July , Lieutenant-Colonel Engelhardt von Plischau assumed command of the regiment until In the summer of , the new regiment was sent to Northern Italy.
However, the soldiers were unhappy about this order and some deserted on the way. It reached the vicinity of San Benedetto in September. At the beginning of October, it lost additional men through several diseases. By the end of March , the regiment had been reduced to only 1, men fit for service. On 7 November, it took up its winter-quarters near Ferrara. In the Spring of , the regiment was divided: one battalion led by Major von der Lippe went to Austria and formed part of the garrison of Vienna.
Detachments of this battalion were sent to collect recruits in Bohemia and Moravia. On 13 June, they took part in the Battle of Raab. The rest of the regiment 12 companies remained in Italy as part of the garrison of Mirandola, which was blockaded by the French during winter. These 12 companies, commanded by Lieutenant-Colonel Plischau lost a lot of men to illness. By November, Plischau had only men fit for service and provisions were scarce.
In April , the French undertook the formal siege of Mirandola , which capitulated on 11 May, its garrison including men of the present regiment surrendering as prisoners of war. The French Lieutenant-General de la Para took possession of the fortress. In the spring, all troops stationed in Hungary were sent to Bavaria. Furthermore, the remnants of the companies stationed in Northern Italy also marched towards Bavaria, where they joined their new proprietor, the Baron du Saix d'Arnant.
