Well if you have the land you can divvy them up into smaller piles over stumps and logs. That way you provide habitat for the lower mammals that will work its way of the food chain.
Years ago I learned my lesson to burn as you go or pretty soon you have a pile the size of a 2 car garage...now what are you going to do?
On the windward side of a small green pile just concentrate on starting a small hot spot in the brush with used motor oil and a touch of diesel. The rest will catch eventually...a small fire with a few chairs around it is a camp fire. Usually they are exempt from burn restrictions. Good luck and be careful if you do burn because if you start a forest fire your azz is grass.