The problem with this map can be summed up looking at one field, A27. South country starts with it, it's 10 miles from a north country base. Problem is, the north base has three bases within walking distance from it, so there is no way to defend or re-take 27, without being able to flatten four bases at once. Only way to get an attack on 27 to happen is via a mission, people will not fly out there on thier own, it's simply too far from any other south country base. Without 27, it's impossible for the south country's "march up the coast" to succeed.