First the easy part.
With AGs short set and Chris' 19, I think you can do 20 too...
Comments on the save:
- Why didnt you finish the riverside hill's mine, we were mining in the previous save?
- Why build the road near London first?
The worker could have pastured the Horses by now for a 1/4 tile instead of working the Plains hill for 3 hammers.
Anyway what is done is done... We need that monument (IMHO) ASAP, dont much care about growing at the moment. Keep working the hill I think, get the Monument out of the way.
Let the worker finish the road on that hill, then get those horses up and running at Horico. Start a barracks? Or maybe some Chariots? After the monument.
Wow, combat archers... he either run into barbs (did he kill that barb warrior too) or build the barracks real fast!
Lets look at the situation.
Not having finished the mine now turns into a blessing, cause he cannot pillage what is not finished.
32 hammers into the Axe, 44, 56 (4 overflow)
48/12 = 4. So in 2+4 = 6 turns we have 2 more Axemen, making 4 at Athens. They should easily deal with the Archers.
Dont face the Achers on hills or in forrests, do so ON OPEN GROUND! This makes odds in our favour as 3+20%+10% = 3.9 vs 5 for our axe. With any luck we beat them both and get CR promotions
Park an Axe on the Copper, Park one on the Banana. Leaves one in London at the time the Archers get to the cows. Maybe he smash his archers into our Axemen but that is unlikely

We can risk the Banana, but leave the Cows open so maybe he heads there?
With no Axe on the Banana and 1 Axe IN London and 1 on the (roaded) Dye. We should be able to tackle the problem.
OR We can get Technical, if I understand the AI properly:
Park Axemen on both the banana and Copper.
The Archers should march to the Cows.
When the Archers are on the Forrest East of London (we have 1 Axe at that point in London) Move the Axe on the Copper to the Dye. This should make the Archers turn towards that again.
Now Reprotect the Copper and the Archers go north again. If need be repeat the process to allow for Axe#5 to finish in London.
Now that we have 2 Axemen in London, allow the Archers to move to the Pasture and KILL them where they stand (hopefully)
Build que for London IMHO:
Axe => Axe => Worker => Axe => Axe => Barracks?
Existing worker:
Road that hill
Run to Horico
Pasture/road those horses
Road back to London one or two tiles to meet with Worker #2
Chop a (plains) forrest to kill time and speed up the Barracks/Chariot(s)
Pasture Cows
Farm Rice
Second worker
FINISH That mine SE of London!
Road that hill (for faster movement south)
Road to Horico
Road to Gold/Mine the Forrest hill Worker #1 is currently on.