[French Army Mutinies] (http://www.reddit.com/r/AskHistorians/comments/350akm/how_serious_were_the_mutinies_and_morale_problem/)

This is the answer I gave for a previous, similar question.

The Mutinies affected almost all the units involved in the Nivelle Offensive, probably 50 000 men at the very least, and left the main body of the French Army immobilized from April to June 1917. In August and October, the French launched attacks at Verdun and La Malmaison which were very successful, the latter attack completing the tactical aim of the Nivelle Offensive in driving the Germans off the Chemin Des Dames Ridge.