You'll note Hood's Corps in region Stark, MS will not retreat due to lack of a suitable path. But according to the manual:
Finally, you cannot retreat from battle into completely hostile regions (i.e. less than 5% Military Control).
There are about 3 regions surrounding me which I have 20% military control. It does appear that my opponnent has single elements in each region, however. So, a single element qualifies as 100% military control as well? If so, the manual should be ammended.
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EDIT And just to add a thought, if thats the case its just not right. How could a 1,000 man element block an entire region, which is hundreds of miles in some cases?