question: How many months after Powderville, Montana became the first establishment in the county, did Mizpah Creek incidents begin near the Powderville telegraph station?
#1 return Powderville  Montana became the  first establishment in  the   county 
#2 return Mizpah Creek incidents did begin near the  Powderville  telegraph station 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #3 and  #4 in  months