The Probert Encyclopaedia of Warfare

BANQUETTE

In fortification, a banquette is a small bank at the foot of a parapet, from which the defenders can safely fire over the parapet. The height of the parapet above the banquette was usually about 1.3 meters; the breadth of the banquette about one or two metres according to the number of ranks to occupy it. Banquettes were frequently made double, that is, a second was made still lower.
Research Banquette