1x 800 Fighter planes. attack wing
1x 800 heavy tanks, 1000 heavy arty. long range div
1x 400ish precision bombers. attack and bomb wing
1. move ground unit into enemy county and within 35 miles of each enemy air force unit, and attack it with fighter planes
(Must be within 35 miles otherwise air force isn't supported and receives a 80% (1/5th or something) reduction in attack and defence)
2. move ground unit to a city, use precision bombers to attack/clear defence then use ground unit (arty and tanks) to attack target and destroy it. repeat this step for all cities, factories and capital.
* Can use arty/tanks to clear defence if you wish, but it's more costly i believe and may be frustrating to wait for stupid supply units if you only have the 1 division
3. by this time, check the "Explain enemy war index" up the top right and see if "Occupy Country: