Similarly Tallard led at Blenheim though he was in the presence of the Elector of Bavaria. Louis XIV shows us two possible options, he himself in his early reign was almost always present on major sieges and often during battles, but had the good sense to let men like Turenne or Luxembourg do the actual commanding. It was however the same Louis that allowed his grandson to trump the authority of Vendome which led to the debacle at Oudenaarde. Louis XV and the Dauphin himself were fighting in Fontenoy, but were smart enough to let Maurits of Saxony do the commanding. The examples and counterexamples are numerous, it comes down to case-specific situations, general rules do not exist.