Regarding supplies; military equipment, ammunition, recruits, food and water is of course important but even better is to cut off the medical supplies. Leaving the enemy with the wounded (which in this situation must be a rather substantial number, given all the bombing) rotting away helplessly. Now; that is a morale-breaker.
True that about the medical needs. It is why it was particularly meaningful that ISIS found a well of medical care in occupied Golan and from what I read, in Israel proper.
Well, it´s a matter of historical record that they were very smartly geared out in 2014 and going into 2015 by capturing Humvees, tanks, artillery batteries and enough other stuff for an army. Not sure when or if the U.S. got tired of sending more stuff over to replenish the Iraqis only to have it captured as before. The tide seems to be turning now, at least for the moment. Apparently ISIS is having problems obtaining new recruits and supplies so I guess the Russians have been doing something about the supply lines, which of course is always key in warfare.
From what I hear, the upper management of ISIS is being evacuated by the West. The mercenary strategy which worked so well in Libya has failed in Syria so it seems, but it took a hell of a toll on the citizens of that nation. When Putin publicly stated that ISIS (and others) were simply mercenaries and they work for whoever pays them the most (and he knows the pay-scale) it was only stating what those of us who've been paying attention have been hearing for years.
I started reading in many places various disjointed reports of the 'refugees' moving to Europe where surprisingly rich in single military aged men of late. Also that most of the 'Syrians' were not from Syria at all...or not by birth at least. The thought that these mercenaries next benefactor would be paying them to operate in Europe crossed my mind and was almost to awful and conspiratorial even for me. But the suggestion really fits the reports coming out of Germany now. From where I sit is seemed like a completely far-fetched and strategy which could never work even if the goal was to make Europe look like Libya and/or fertilize a new set of extreme nationalist political movements. Now I'm not so sure. Getting people so mad that they would welcome full scale war and ethnic cleansing in SE Asia might actually be achievable if approached as a project which is expected to bear fruit a generation or two out. In the here and now, people will soon be begging for bio-metric ID (if not chipping for all)...and the contracts with the corporations which will do this were signed a year ago from what I read.
The only thing I've seen Switzerland do right lately is to suggest to their citizens that they stock up on guns and ammo because it looks like it's going to get ugly out there. To bad for the rest of the European populations that that is not a viable option for most of them.