Being a uniform and flag design service to wargamers and to the imaginary crowned heads of 17th and 18th Century Europe, especially of the Seven Years War period - now By Appointment to the Court of Saxe-Bearstein! (But please note that the uniforms and flags presented here are not fictional - they are genuine 17th and 18th Century uniforms and flags that are as authentic as I can make them from my sources.)
The Jäger Corps was raised as a small unit in 1758, made a large independent unit in 1761, but disbanded in 1763. It was distinguished at Torgau.
The pioneer battalion was raised in 1758 to give commanding officers a force able to move with the advance guard "to widen and repair roads and set up light timber bridges" (Duffy, Army of Maria Theresa). They were so useful the unit was more than doubled in size in 1759 but the unit was most unfortunately disbanded as part of the drastic economies of 1761-2.
The Sapeur-Corps was raised in 1760 to provide a body of skilled labour for siege warfare and rapidly distinguished itself, notably at the siege of Schweidnitz in July 1760. It was again distinguished in the defence of Schweidnitz in 1762, where out of 24 sappers 10 were killed and 11 wounded. 3 officers were awarded the Military Order of Maria Theresa, which Christopher Duffy says "must have been a record for a unit of this size" (Army of Maria Theresa, p.120).