During 1805-1810 they would have fought for the Kingdom of Holland (which fought for France) during the 100 days campaign they would have fought in the United Kingdom of the Netherlands but the only Dutch/Belgian heavy cavalry units were the 1ste (NL) Karabiniers, 2de (BE) Karabiniers, and 3de (NL) Karabiniers. These units made repeated and effective charges against the French heavy cavalry during the battle and shattered the French cavalry charge on its left wing. They were arrayed with the 1ste on the left, the 2de in the center, and the 3de on the right and their uniforms were very similar but the 1ste and 3de wore bicornes and the 2de wore silvery helmets with tall black crests much like the French carabinier helmets. Facings were as follows 1ste (Purple) 2de (Red) 3de (Yellow) the 2de was led personally by the Prince of Orange to route and pursue the French cavalry off the field with the cry of "Come my comrades, let us put our sabers to these Frenchmen! The victory is ours!" Overall the Dutch/Belgian carabiniers performed very effectively and served with great distinction, showing their British comrades that they need not doubt their skill nor their courage. And any question of their loyalty died on that field.