That's exactly the point. I'm not here to tell people off or to say that you're wrong and he's wrong and all that. I'm just trying to figure out why you do what you do. 1) Who ought to get the XP? I don't believe in using CR3 melee and upgrading them to gunpowder because I feel that CR3 melee are too specialized for city killing. Later on, I can always get Pinch promoted Gunpowder to act in a variety of roles, not just city attack. While I can appreciate the role of CR3 in a big enough stack, I don't like the fact that I can only ever use them best for taking cities. Siege units are another thing entirely. You only usually ever use promoted ones for attacking cities anyway, so there's nothing to stop you from specializing them for a role they're already specialized in. For this reason I prioritize the XP of Catapults for the eventual push for CR3 Cannon. While I CAN produce CR3 Cannon out of the gate later on, having a set of such units on the field where they're needed is a huge benefit, IMO. 2) Who fights difficult battles? Well, obviously siege and flankers are best at that, and there's often talk of "suiciding" these units to great effect. Once I have a moderately experienced Cata or Treb that survived an unlikely attack, I push those to the safer part of the curve to preserve their experience. I'll usually choose a Treb to attack first simply because a Treb is stronger for attacking cities (8 instead of 6) so is more likely to achieve something whether or not it dies. This is especially so when I have a moderately experience Cata and a rookie Treb. I want to preserve XP gained AND the Treb is more likely to get the job done anyways. Why push the Cata? 3) What do I so with outdated units? After I'm done picking them over for garrison work, I actually disband a fair bit of them, especially if I can make more promoted units fresh from the Academy than they would turn out if I upgraded them. I could suicide them against a stack I suppose, and I do that sometimes, but oftentimes they survive wars and stick around for too long under peacetime when everyone else is already wielding guns. Siege and Mounted units get upgraded because the promotions I favor carry over to the next war, but I don't have much use for upgrading Combat1 Cover Swordsmen when I can make Combat 1 Pinch Riflemen, and nobody's using Archers anymore. You could say that this is a push for making them City Raider Swordsmen, but that just goes into the previous arguments about City Raider Swordsmen and City Raider Riflemen again.