The book requires some thought, it's not a beach book.
It answers a lot of my questions about the patchy and dependent visions of time 'stories' and replace the real problems in the center of the discussion.
Incidentally I learned, as a bonus, many on a number of debates by historians as a major responsibility of the English general Haig, on how the French civil authorities have not released all the military instead of German, on the huge logistical problems that the Germans encountered, and the inability of their industry has taken the war effort was the difference of French industry, and also on the ability of General Petain named after the disastrous offensives Nivelle analyze the terrain and opponents, and invent a new way of rependre the offensive while minimizing casualties.