Mmmm...what about 0 turn recruitment only for peasants and militia type troops (such as town watch and militia hoplites, for instance)? A city could easily equip quite a number of these troops in 6 months (no training or special equipment required).
It could represent a last desperate effort to defend a city. It is said that one of the reasons why Hannibal didn´t assault Rome was precisely this (among other reasons like mobility, lack of war engines, etc.).
I don´t know how the AI would make use of this, though...
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