question: Which had less troops, the Bulgarian 2nd Army or the two Serb divisions?
#1 return troops 
#2 return #1 of the  Bulgarian 2nd Army 
#3 return #1 of the  two Serb divisions 
#4 return number of  #2 
#5 return number of  #3 
#6 return which is lowest of #4 ,  #5