The initial assault on LHS was accompanied by Cuirassiers under Dubois ( 1st and 4th).
The Ponsonby ( Scots Greys) repulse was conducted by Line lancers ( 3rd and 4th) along with the 3rd Chasseurs a Cheval on the left flank of the British advance.
The remaining British units were repulsed by cuirassiers of Travers and Farine, ( 7th 12th) ( 5th 10th ).
The Red lancers ( including the Elba squadron ) were over the field towards Hougoumont during the cavalry attacks.
I hope that this is of help.
Captain Silbornes Charlets feature may be of assistance on this site.
Best wishes,
Chris