How do you choose your battlefield?

[Lysimachos]

I have some difficulties choosing a favorable battlefield in my current EB 1.1 campaign.
I place my armies in places in the campaign map that seem to have an altitude advantage but when the battle starts in my surprise the enemy owns the high ground!
Does anyone have the same problem? Is there any way to positively know the landscape of the battlefield by examining the campaign map?

If you position your army on top of a hill on the campaign map the hill will be in the middle of the battlefield, so you'd face uphill. If you position your army in a way that the top of the hill is behind it on campaign map, they will stand on higher ground in the battle.