- scenario briefings for the campaign
- land units should not retreat when tacbombs attack
- artillery does rugged defense???
- airplanes do not return though out of fuel and in reach
  of an airfield (warsaw)
- whether enemy may attack a truck position must be checked not only
by getting the plain distance but by computing the required path 
to allow placement behind a closed front line
- trucks cannot pass rivers in bad weather and they don't try to take
the longer way around

- AI must protect own cities with units
- AI groups: implement execution order (artillery fire, bombers, 
  fighters, ground units, artillery movement)
- loop execution several times to move when a unit which is 
  handled later blocked the destination position
- tweak tactical action scores (are quite good already though)
- AI does not protect airborne units

??? France with 25/30 turns instead of 13/26 ???
??? AI crashes for no apparent reason (merging error) ???
??? when is the west beaten ???

