Double,
has been invented; it is very simple in principle, and admirably answers the purpose. For instance, if you were to threaten your adversary by a disengagement to the outside, and if, instead of tierce, he parried contre de quarte, the double is then made by your making a second disengagement to the same side as the first, for it will be found that his contre de quarte has replaced the blades in the positions they occupied previous to your disengagement. You will then have an opening, and may finish the attack by the longe.
As all the contre-parades are on the same plan and principle, so are all the doubles. Of course, it is understood that you will make all the movements of the double en suite, and without allowing your adversary's blade to overtake yours.