What is "marache"

Marache, or historically Smohain, is hamlet in the Belgian municipality of Lasne. It is located in a defile through which runs the Smohain, a stream that rises just to the west of the hamlet.

Smohain, along with the two farms of Papelotte and La Haye (which are located on the northern bank closer to the head of the same valley about and west of the centre of the hamlet) and the now ruined Châteaux Frischermont (on a premonitory south of the hamlet) formed the eastern bulwark of the Duke of Wellington's Anglo-allied line during the Battle of Waterloo on 18 June 1816.

This was a strong defensive position as:

Later in the battle it was the location where the Prussian right-hand flank joined forces with the Anglo-allies left-hand flank.