Rajputs of Uttarakhand..

What was the contribution of rajputs in Uttarakhand(Garhwal,Kumaon and terai)..

As Garhwal and kumaon both were ruled by rajputs of panwar ad chand/suryavanshi(rathore) dynasty and terai as well was dominated by pundir and chauhan rajputs..I have also read somewhere that Chand rulers of kumaon conquered parts of tibet as well...What was their relation with other rajput kingdoms of Himachal,Jammu,UP,Rajasthan,Punjab,Delhi,MP,etc..What was their relations with their neighbour rohilla pashtuns and how did Garhwal kingdom react to raiders like sikhs,gujjars,rohillas in Dehradun valley?