Use this city to vector your offensive units. This could be your Catapults in early scenarios and later becomes your Pegasi. In any event, if you have the surrounding cities garrisoned and protected by a defensive stack, you'll find that vectoring all offensive production to this city is a very useful tactic. This new movement system allows for some new strategy while presenting new challenges. Given these factors, there are some things you can do to ensure some success.
Defense is a key.
So keep some Archers in the back line cities as garrison troops. Granted, one stack of archers won't hold off a super stack, but with the missile bonus, you will inflict some pain. A handy tool for this is the Army Report in the Reports Menu button. This report will show the location of all armies in the game at any given time. Learn to check this report frequently during a turn.