question: How many years after the last raid into Hungary by the Crimean Taters took place was the last major Tatar raid that took place during the Russo-Turkish War?
#1 return the  last  raid into Hungary by the   Crimean Taters 
#2 return the  last  major Tatar raid that took place during the   Russo-Turkish War 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3