Scrubbing the gene pool.

[Didz]

You can either move your high-experienced depleted troop back from the frontline to retrain it, and keep its experience, or you can keep training greens to merge with the veterans, who can stay at the frontlines all the time. If you look at it from that angle, it´s not that bad a choice to handle things.

Not sure about that, in the past it would have made no difference. But now that John has pointed out the changes made in the retraining process it would make more sense to withdraw your elite units to a city for retraining rather than merging them with less experenced units.

In fact the best option would be to use the Elite units as ferries to move highly trained troops to from cities to replace the inexpereinced ones lost at front. That would constantly increase the expereince of your frontline troops, over and above what expereince they had earned in battle.