Vastly outnumbered and increasingly outgunned too, ISIS fighters have called on every technique of asymmetric warfare to try and even their odds of staving off defeat, while adding a few innovations of their own. Their willingness to die is perhaps their greatest advantage. For example, a few ISIS diehards remaining behind in a village to fight to the end can hold up a company or even a battalion of soldiers, sometimes for days at a time. ISIS is ready for a long, bloody battle to the death, there’s no doubt about it.