Very interesting setup.
There are some very exciting military strategies with this set up.
I experimented with "Milking the Warlord GGs" strategy.
To hold the entrance forrest hill tile, there are some good options:
a). Build a Fort and use
Gurilla+CG+Drill Archery units
b). Leave the forrest and use
woodsman+drill Samurais.
a looks very attractive due to the immense stacking defensive bonus, but problem is Archery units are weakers than melee counter parts, and enemy CR promotion cancels CG proms. Also taking a detour to Longbow could delay our bigger picture goals i.e. rushing to CS, Liberalism, Biology and etc.
So I went for Samurais.
To hold the tile, I start with woodsman axeman and spearman. When I got GGs, I attached to axeman and
first MAX out to WoodsmanIII, this prom is almost broken as
it gives 2 free first strikes and as much healing power as a MedicIII unit!
With Samurais already came with 2-3 FS when build, so a WoodsmanIII Samurai defending a forrest hill is even better than a longbow guarding a Hill city. It can kill 20-30 weaker units in one turn and gain XP like no one's business.
So I did this repeatedly, giving promotions as follows:
1. Leadership
2. WoodsmanI,II,III
3. Drill II,III,IV
4. CRI,II,III
5. After upgrading to Rifle/Grenadiers go: GurrilaI,II
6. Combat I-VI
7. Commando/Pinch and etc.
Once after maxing steps 1-3, they are nearly invincable, and so I give them CR promos for the future sake since the CR promos are not available to gunpower units.
I rotate out the samurai GG who obtained all promos after step 4 to let greener GGs to defend and reach that status. If you just let one strong GG defend, he will hog all the XPs and other GGs will never be able to reach all the CR promos needed.
Very quickly I had 6 GGs with all promotions at step 4. So if I continue to Mech Infan, These guys all will become menance city busters...
I do paid a lot of attention to AI stacks, if it gets too big, I put all waiting GGs into the defending stacks just to be safe.
Lots of fun so far, thanks for setting it up
