As the title states, in 1.2 attrition at least in barbarian lands is based on the maximum strength of the army, not its current strength. The simple test I just ran: moved 20000 men into a barbarian province facing a 5% attrition rate caused them to loose 1000 men to attrition each months even after their original strength had gone down. If attrition was based on current strenght, losses should be 1000 in the first month, then 950, then 903, then 857...
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