Hi there,
Of the four Troops of Horse Guards, Thoyts Troop suffered the highest casualty rate with 20 men killed or missing from a nominal strength of 77 at the start of the battle.
If, in addition, the total number of men who were wounded, unhorsed, captured, or non-combatant is added it is difficult to imagine more than a handful of men left at the end of day.
Hope this is of interest
Kind regards
Martin Aaron