Here is where I mean, forgive me if you've already checked there.
I did a double check of that area. It cannot be capped from those points on the ground. I think the perspective of the screenshot betrays the actual height of the wall itself.
Ok it looks good. For balance i see two problems perhaps you already have thaught about them but thats what i see for this map.
You made the cavattackways the main-attack ways right?
The two ramps are the main attack-ways. You go up one of the two ramps, bust down the door, and either just cap the flag or open a winch to a small walkway down the middle.
Is this map still balanced if there are many cavplayers on one team?
Well the ramps are the natural choke-points. Even though cav can run up them at full speed, a single pikemen could block a cav going up the ramp. Most of the calvary action would happen in the small open area below the keep. Attackers might have a few problems if there were a lot of defender cav but if they get a good foothold on the ramps they should be fine (note: there are no defender spawns on the ramps themselves). The keep itself is a bit small for cav but a plated charger would do ok inside.
How long have foot soldiers to run to flag?
I tested the time it took (assuming all gates are down):
Infantry took between 50 to 60 sec to reach the flag
Calvary took between 25 to 35 sec to reach the flag
Using the middle ramp, infantry took between 40 to 45 sec.
I did a test on Turin Castle to compare the times. Going up the ladder and walking down to the flag, it took me a comparable 50 to 60 sec to reach the flag using the same char.
We have to play the map but general i would suggest to have one infantry attack-way that is shorter and one cav-attack way that is longer.
Here is a screenshot of the winch gate that I referred to (not visible in the above screenies). Maybe this happens to be what you were suggesting.
Its basically a long set of stairs. Calvary can go up those stairs but not at full speed. Cav are better off using the side ramps. Infantry on the other hand get a 5 to 10 sec reduction in walk times.
Another point is the use of ladders. How fast can you be at the flag with ladders?
Well, ladders do not actually reduce travel times themselves. They can, however, allow you to skip the inner and outer gates and open them from behind (both are sally doors). If you put a ladder across the center of the river and over the wall and used the middle stairs, I think you could cut out 3 to 4 sec of walking.
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I can't say for sure how it will turn out as I do not have any prior experience. As of now I am a bit worried that attackers might have a slight uphill battle but I have plans to adjust things if that turns out to be the case.