Well, I could clear one crystall province with ents really simple. There were only orcs and war dogs. I fought always with five squads of five ents each and lost after all eight encounters only 10 ents
Actually the enemie attacks those first, who have the highest initative. So if you get ents don't forget to take sword dancer with you, because other wise your archers will be attacked first. I lost already 120 archer in one fight because I didn't know that :/
Top tip right there! These should be highlighted in any Elvenar guide, specially for beginners who have trouble winning their fights. Pretty intuitive when you have fought a number of encounters, but still.
Initiative (the unitswith the highest initiative moves first, then the unit with the second highest, etc. The enemy also focuses on attacking the units with the highest initiative, though if they cannot reach those units, they'll just attack whichever unit they can)