I guees was random, because some movements go well, and other no.
some walls are made and others no.
And didn´t make any of my attacks only one
 
Example: i put 15 inf in a NT and drop them in Germany and added in Berlin, after i take my empty NT and send it back to UK.
                after end turn, the NT was on way to uk with all inf
 
That AT have 4 inf and i attack Benghazi whit them, but no
 
Was a good wall but no
 
$tanks in AT, where is the AT? And i attack whit those tanks... no
 
Have many more