The allies, however, continued to retreat, but unfortunately Vandamme, with his single corps and unsupported, issued out of the mountains on their flank, threw himself across their line of retreat near Kulm, and was completely overwhelmed by sheer weight of numbers (29th).
The charge was admirably executed; it overthrew one British regiment which it caught in line, but being unsupported it achieved nothing further of importance, and was beaten back.
The Dabormida division, unsupported by Albertone, found itself likewise engaged in a separate combat against superior numbers.
The roads for drawing the coal from the working faces to the shaft are kept open by walling through the waste or goaf produced by the fall of the unsupported roof.
Thus a maximum of filtering surface with a minimum of liquor in each bag is obtained, and a fa .r greater number of bags are got into a given area that would otherwise be possible, while the danger of bursting the bags by leaving them unsupported is avoided.