Gotta to agree completely with the last post 
Though six monthes, in the game, is quite short. The armies move very slowly (often 15-25 days to get from one province to another), so I would either slow the attrition, either accelerate the movement.
As a side point, I feel the siege far too short compared to the movement rate. Accelerated movement but considerable slower sieges would be good.
As for attrition, I would say that :
- Up to the supply limit of the province, a 1 % attrition.
- After the supply limit of the province, a progressive curve, where each 25 % more men than the province can supply, raise the attrition by 1 % (so if the province can support 10 000 men and you bring 12 500, you endure 2 % attrition).
- A cap limit at 5 % in plains, 7,5 % in mountains and 10 % in deserts.
- All these numbers (both the attrition level and the cap) are halved in friendly territories, and doubled in hostile territories.
How is that ?
Though six monthes, in the game, is quite short. The armies move very slowly (often 15-25 days to get from one province to another), so I would either slow the attrition, either accelerate the movement.
As a side point, I feel the siege far too short compared to the movement rate. Accelerated movement but considerable slower sieges would be good.
As for attrition, I would say that :
- Up to the supply limit of the province, a 1 % attrition.
- After the supply limit of the province, a progressive curve, where each 25 % more men than the province can supply, raise the attrition by 1 % (so if the province can support 10 000 men and you bring 12 500, you endure 2 % attrition).
- A cap limit at 5 % in plains, 7,5 % in mountains and 10 % in deserts.
- All these numbers (both the attrition level and the cap) are halved in friendly territories, and doubled in hostile territories.
How is that ?