The Mouse that Roared

What is to be made of the recent crisis in Nigeria that pitted the outgoing government of Goodluck Jonathan against Boko Haram? How is it that a rebel group consisting of a core of some 7,000 to 10,000 fighters using mostly small arms and bombs has been able to resist, and often rout, the largest army in West Africa? Why has this conflict lasted for close to six years? Why was the presidential election scheduled for February 14 postponed for six weeks, and why in the interim were foreign mercenaries brought in to do battle with homegrown insurgents?