zena hoder brings us a look at the destruction the islamic state left in one town north of mosul. >> reporter: the scars of battle. the islamic state group used houses as defense lines before it was forced to retreat to the city of mosul. they came back home to find this. the group's fighters moved into madria village in mid august. they did not only use the house as a base. they tell me they ate whatever food they found, they even used their clothes and they didn't give up without a fight. this is an organization that u.s. officials say is beyond anything they have seen. even those who engaged in direct combat say they faced well trained fighters. >> they placed a few snipers in different houses. and they did all the way, the roads, put the tnt. >> reporter: the islamic state may have been pushed back from the mosul dam and the area, but far from defeated. didn't win this battle alone. dozens of u.s. air strikes supported the counteroffensive. undoubtedly air power does damage. it may have been an option here but not always the case. the islamic state group controls cities, populati