I am not sure that Wellington's influence over the choice of the cavalry generals he was commanding was even as great as the limited amount described in this article. Wellington was very unhappy with the conduct of Grant's hussar brigade at Vitoria. Grant was superseded and sent home, only to be foisted on Wellington again as Long's replacement. This was because Grant was a favourite of the Duke of Cumberland and the Prince Regent. In contrast, Long had very bad relationships with both royal brothers. I imagine that Wellington found the replacement of a 'writing officer' by a royal toady to be no particular joy.