If the fief is in rebellion and you are in the fief with troops, you use this option to attempt to quell the rebellion. In effect, a "Quell" is the same as a "Pillage" and this is how you do it. You need an army to do this, at least 100 troops. The minimum ratio is one soldier for every eighty people in the fief (or 12.5 troops times the population in thousands). The more troops you have the easier it is. If you don't have enough troops, the locals will throw you out to an adjacent fief and you'll have to march back in and keep trying until you succeed. A success is equivalent to a pillage. That is, you make some money, but do some damage to the fief in the process. Note that what you call pillage today, was extortion then. What we call pillage then you would probably call atrocities today. We don't rate stature as historians but as contemporaries would view it. This is why the pillager losses stature when pillaging. The English funded the war for many decades through extortion and conquest (siege). Pillage is counter productive as it destroys the wealth you seek to exploit. The fought over parts of France were not destroyed as the Rhineland was during the Thirty Years War. Most of the brigands stole and extorted. The noted English mercenary Hawkwood, for example, was a businessman, who was out to get rich, not kill the geese that provided the golden eggs.