Here's the next set of flags in the continuing Rossbach Prussian flags project - IR 5 von Braunschweig.
First raised 1655. Lieutenant General Duke Ferdinand of Brunswick was Chef of the regiment from 1755-1766. The regiment fought well at Lobositz 1756 and the king awarded its officers 3 Pour Le Merite medals for the action. It was highly distinguished in the battle of Rossbach 1757. Losses were low, although the regimental commander Colonel Johann Christoph von Prignitz was killed. The king gave its officers 15 Pour Le Merite medals for Rossbach "because of their particular bravery and good conduct shown in the last battle". IR 5 fought at Leuthen 1757. At Hochkirch 1758 it formed part of the rearguard that protected the retreating army. It suffered fairly heavy casualties at Kunersdorf 1759. At Liegnitz 1760 it contributed to the counter attack that threw the Austrians back over the Katzbach. It suffered heavy casualties at Torgau 1760, mostly from enemy artillery on the Süptitz heights. It was one of Frederick's most reliable regiments and always fought with the King's army.
And this is the uniform of a musketeer of IR 5 in the Seven Years War:
