I haven't played Civ since maybe Civ 1 or 2 so I couldn't really tell you how it compares; but ground combat is going to be a lot like Advanced Wars (1, 2, Days of Ruin), and I'm told some mechanics are Civ-like.
We are also adding on top of that by having a cycle take place over several "simultaneous turns". (which is all calculated behind the scene using your general directions and the Rules of Engagement, which function like tactics but for ground troops, you set for your units.
Mechanically, its like being a general giving orders to your troops who then go out to execute your orders and you give periodic updates on their objectives while they are in the field.
After a cycle has been played out, you'll be able to view it in the steps that occurred.
This also allows you to view what happened days, weeks, months, maybe years ago in both the overarching scenario and on a confrontational basis.
This is something we might integrate into the website so players can view it on the go or maybe share their "replay" with friends.
You may have your troops moving down a road to suddenly be ambushed from the fog of war; because your units are ambushed they take damage before they can retaliate and will do so with diminished manpower.
If you have vision on your attackers before hand, both sides will take damage as though they had full manpower the entire time.
Additionally, we may have single/multiplayer missions taking place in premade scenarios on the ground in which players can play at their own pace instead of relying on the global cycle speed of the game.