That's fantastic Avarron.
My fellowship asked me to pull the last few posts all into one. Here goes...
Creds to Philiplessis and Jixel and Avarron. Any errors you can blame on me.
General configuration (when you don't know what else to try): 3 treants and 2 sorceresses
Marble: some encounters are a mix of golems and steinlings. 5 squads of sorceresses II will do the job. As a bonus, these guys cannot reach them during the 1st round, so you have first fire
Planks: One Treant, three Golems, one Sorceress (depending on the exact composition of the enemy squads - e.g. sometimes the encounter is two enemy stacks of Treant II (or one T II + 1 Swamp Monster) - then I use 4xGolem + 1 Sorceress)
Steel: Use 4 squads of Golem II, 1 Sorceress. Usually the opposing archers advance, then your Golems can take them out. Next priority is to get at least one Golem unit to attack the Cannoneers, using the sorceress to limit the damage from the Knights. Once the opposing ranged units are all gone, work on one squad of Knights at a time, rotating around the others with the sorceress.
Crystal: 5 squads of treants will do the job with minimal losses. [Note: If the terrain allows, you can sometimes further reduce losses by adding a sorceress strategically (usually either position 1 or 4). This is best done when the terrain would not allow all 5 treant squads to fight anyway.]
Scroll: 5 squads of treants if there is no more than 2 squads of crossbow/archers; otherwise bring the sorceresses in. [Note: I've also had luck using sorceresses with the granite golems, but those golems are expensive]
Silk: One or two Treants, two or three Golems, one Sorceress. in silk provinces, some encounters are a mix of archers and cannoneers send in 5 squads of sorceresses and make sure you stun the enemy squads in turn, so that the broken valor effect does not wear out minimal losses - mostly because the enemy strikes first - big success
Elixir: Granite Golem FTW. But also consider trying 3 golem, 2 sorceress
Magic Dust: 3 squads of treants and 2 of sorceresses or 3 treants and 2 golems
Gems: 1-2 Treants to absorb the cerberus attack. Golem or Sorceress go after the archers. If you get those out of the way take your time and reset your troops so that the knight has to come closer and you can launch everyone in your counter attack instead of chasing him with one advance troop that he picks away at. Note: I've also had luck putting a treant in front of the knight and letting him pick away at the treant while the golems cut the knight down bit by bit.