I crossed the 3000 medals today. Placing resources outside in one spot works well up to 2800 medals, as well as sniping town centers with a combination of two tanks, 3 wallbreakers and lots of motorcycles – they're fast and reach the town center quickly while distracting with decoys. After that, I switched to heavy tanks army. But the loss of oil is just too much for a mere 5 medals in average. Mountainking's strategy works best so far as for the medal range above 3000. It's a very slow process, but steadily going up. Will try Mythkol's combination as well, as it seems reasonable considering the silo and the fact that it takes only food in most cases. If I continue at current pace, I might get 3200 medals within the next few days.
Mythkol's strategy didn't work well for me at 3000+ medals. Town centers are protected too well within this range. Getting medals now is very slow!
Crossed the 3100 range today, currently using 15 bazookas with heavy tanks and 2 APCs. Have 2 shooters in spare for luring defending troops away. I concentrate on Town Centers which are close to the walls. First throwing a decoy to take out traps and activating defenders from TC, then shooter in one corner to distract them, so that I can place a heavy tank and/or bazookas to quickly breach the wall and snatch the TC. Only going for bases with at least 15 medals to get. Quick victory gives about 5 - 7 medals. No full attack, except for very easy targets (which are rare). Placed a bazooka tower I still had from an event and put my resources outside, including the oil refinery. Hopefully some looters will pass and take oil in exchange for medals when they see it's so easy to get but too hard for full attack because of the bazooka tower. Let's see how it works out.
Placing the oil refinery outside didn't work. Above 3000 they're gonna make a full attack anyway. Had one successful defense last night, but then got 4-starred by a guy using a strategy with lots of infantry and the skillful use of demolition combined with his bomber and planes. However, I crossed 3150 medals now, hoping to get the job done this weekend