( Reuters)-Some 200 Myanmar military personnel withdrew to a bridge connecting the border town of Myawaddy to Thailand on Thursday following a days-long assault in the area by anti-junta rebels, according to an ethnic armed group spokesman and local media. Myanmar's military-run government is battling armed rebel groups on several fronts and has suffered a string of defeats in frontier areas. The retreat of junta troops in Myawaddy, which is adjacent to Thailand's Mae Sot, signals the potential