The OP spent last weekend on a Battlefield tour with the British Commission for Military History to the battlefields of the Allied Spring Offensive of 1917. Travelling with a bunch of military historians is more of a master class seminar than a battlefield tour. The historians leading on different aspects included Tim Gale on French Tanks, Tony Cowan and Jack Sheldon on the Germans in Spring 1917, Michael Orr on Bullecourt,(and Gavrelle), Andy Simpson on Arras, Robin Brodhurst on Monchy-le-Preux and Gordon Corrigan on the Canadians. The OP’s contribution was to defend the reputation of Robert Nivelle and the odd matters artillery in the absence of a more distinguished Gunner historian .
– Was there any real learning curve in the Allies in 1917?
– Was there any way that the Nivelle Offensive could have been successful?
– Did the Germans really have a consistent “elastic defence doctrine”
– What were the Russian Brigades doing on the Western Front?
BTW did you know that the lethal strain of Influenza that killed more than 45 million in 1918-19 first mutated in the British military hospitals in Etaples.