What is bullshit about pahari/pothowari being foreign to this land?
One reason why Muslims in western Jammu Province were pro-Pakistan were their geographical, historical, ethnic, cultural and economic connectios with, and reliancce on, Punjab and NWFP. With homelands located in the foothills and highlands that abutted the end of the Punjab plains, people in western Jammu spoke dialects of Punjabi, such as Hindko and Pahari (as against Dogri in eastern Jammu). For them, western Punjab and NWFP's Hazara region located on the western side of the Jhelum River that divided the constructed entity of J&K from British India (later Pakistan) were geographically closer and more accessible than the remainder of Jammu Province located east of the Chenab River. To travel to the Kashmir Valley involved crossing the difficult Pir Panjal mountain range via longer and more difficult routes that were often snowbound in winter. For Poonchis, Rawalpindi, which was connected by road and rail to Lahore, was closer and considerably easier to reach than Jammu City. For Mirpuris Jhelum town, which was on the same railway line, was closer and easier to get to than Jammu City.
Read about the origins and ethnic affiliation of the Poonchis and Mirpuris.