A short RAND commentary, post-Paris murders:http://www.rand.org/blog/2015/11/the...y-of-war.html?

Two passages for economy of effort:
What makes the French way of war distinct from, say, the U.S. way of war has to do with scarcity. The French military is highly conscious of its small size and lack of resources. This translates into several distinctive features of French military operations. One is an insistence on modest objectives, on limiting strictly the aims of a military invention in line with a modest assessment of what the military can accomplish. The French thus aim low and strive to achieve the minimal required. Whenever possible, they try to limit the use of the military to missions for which militaries really can be of use. Meaning, militaries are good at violence; if violence is what is required, then send in the military. Otherwise, not. The French military abhors mission creep and want no part in things such as 'nation building.'

They strive for sufficiency and hope to achieve limited goals through the application of the smallest possible measure of force, what they refer to as “juste mésure,” i.e. just enough to get the job done, and no more. This requires knowing how much is enough, not to mention accepting risk that Americans would prefer not to run and largely do not have to.