Can someone explain what happens in the following situation?
USA has entrenched stack in region A, in defensive mode.
CSA moves into region A from region B (in unknown mode).
At the end of the turn, no battle occurred and both armies now occupy the same region.
USA does not want CSA army in region and wants to attack it.
If USA goes into offensive or assault posture to ensure engagement next turn, does the stack lose entrenchment after the battle?