Role play
* Carrying the knight's armor, shield, and sword,
* Holding any prisoners the knight takes,
* Rescuing the knight should the knight be taken prisoner,
* Ensuring an honorable burial of the knight in the event of his death,
* Replacing the knight's sword if it was broken or dropped,
* Replacing the knight's horse with a new horse or the squire's should the horse be injured or killed,
* Dressing the knight in his armour,
* Carrying the knight's flag,
* Protecting the knight if needed.
In game roles
Private grant carraying
Represents their lord in other counties if they cannot be their themselves
Travel with the knight incase of the need for back up or for company
Fights in any battle the knight is in
they are the ones i can think of off the top of my head