Using
@crackie's squad differences and assuming 0 boosts applied from AW's, Fire chickens or temp boost bldgs:
609 Dryad III @ health of 106 each has a squad health of 64,554
1218 Elite Archer @ health of 59 each has a squad health of 71,862
That squad of Dryads is going die easier than the squad of Archers.
After years of manual combat, I don't use this much anymore, but until I learned the relationship between initiative and placement, the following was extremely helpful:
In manual combat, on the bottom bar, there are icons of each unit on the field (both your own and enemy squads) that you can hover over and get the attack/health stats for that squad of troops. It adjusts every time a squad takes a hit and reflects current strength of units remaining in the squad in real time. After taking a hit, both the attack strength and health decreases by the number of individual units killed in the hit. I find that more helpful than looking at what the Army Camp tab says about the squad stats. Those only apply to the start of a battle on the world map provinces and I do a lot more tourney/Spire encounters every week than map ones. Plus, comparing real time stats of my units v enemy units is very helpful when making the decision about who is going to be the next enemy target. This bar also shows squads in the order in which they will get a turn, again updating in real time.
I also have no clue how mobile only players ever learn all this, lol! They don't have access to any of that information.