Milhaud's Corps provided support for D'Erlon's large attack on Wellington's centre. Dubois' brigade appears to have been involved in the fighting around La Haye Sainte, initially to assist other cuirassiers who had had some success against Hanoverian infantry but have then been counter-attacked by elements of the Household Brigade. Dubois charged into this melee and may then have also been attached by the Union Brigade as it charged into D'Erlon's infantry. Apparently during this encounter the coloner of the 1st Cuirassiers had his epaulettes ripped off by a captain of the 1st Light Guards. It is not clear whether Dubois' brigade then took part in the later cavalry attacks on the allied centre or was sent to participate in the defence on Napoleon's right against the advancing Prussians.
So it seems that we don't know for sure whether Dubois was ordered to charge the allied square with the French cavalry in the late afternoon. Which is a shame, as the Foundry figure here has a wonderfully angry expression, as if he's saying to his ADC "tell the Général de Division that I'm not throwing my command away by charging British infantry in square". Maybe instead he's asking the ADC to ensure that the 1st Cuirassiers' colonel finds some new epaulettes. The ADC, also from Foundry, is painted as a junior officer in the 7th Hussars, following a colour scheme in the Histoire et Collections French hussars book that is slightly different to the standard uniform for the 7th (I couldn't see a way of painting this figure in the more usual dark blue with light blue facings ADC uniform). I'm assuming that there is no reason why a heavy cavalry general shouldn't have a light cavalry ADC, and the two figures seemed to go together quite well - Dubois is clearly rather agitated about something.
2 figures. Painted June 2015.