Task: Question Decomposition
Input (English): question: Which occurred first, the Nivelle Offensive or a British attack at Passchendaele?
Output (English): #1 return the  Nivelle Offensive 
#2 return a British attack at Passchendaele 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return which is the  lowest of #3 ,  #4