So about after 200 hours of playing FE:LH, I actually managed to run into unique problem.. Iron shortage. yeah.
Normally I'm swimming in iron. So I cranked out lots of light plate armor soldiers with no worries, I didn't even look at iron at all because I have thousands and thousands.
But.. Iron shortage.
It has led to various situations like.
That big nasty Fire Drake guarding the only Iron resource near me, and all other iron resources is too faraway, so I suicided lots of Militia armies just to get at that sweet sweet iron just to upgrade the weapons. I mass like ten armies of militia and auto resolve them all. After they all done suiciding I send in my bestest armies on same turn and attempt to finish the drake off, it usually succeeds. yeah, those militia only had wooden clubs and clothes. They died for greater good.
Silly battles like,
Obsidian golems showing up when I still can't upgrade to boar spears cuz of Iron shortage. But Obsidian Golems always lose because I outlast them via heal spam while whittling them down with spears.
And Yithril, I dunno how they do it but sometimes they occasionally bum rush me before I even research Blacksmithing and I'm forced to fight their Plate armored with just spears. Never before I have felt the difference in armor so clearly. Problem is, Yithril just sends one army and fail instead of maybe 2 more to seal the deal after their plate armored soldiers die off. I see armor values like 40, or 80, I forgot Can't remember atm. Huzzah for swarming bonuses 
And Once, I couldn't even get a single Iron Mine up and running until I had like Armorer tech completely researched because my land had none but I was swimming in crystals at least. Mages aplenty! I managed to forcibly acquire iron mines from other factions. And then the only Iron mine that was actually in my territory that I finally got it dug up from bazillions of monsters protecting it, because there was so many monsters, I neglected to explore deeply in that direction due to the monsters being powerful. Thus even when there was iron there, I won't be able to mine it anyways due to powerful monsters. lol
I like the Iron shortage, it has forced me to come up with a leather armor design spearman which can be spammed when I'm low on the iron instead of spamming light plate armor spearmen all the time. Thus I don't have to stop producing troops when I don't want to. 
Made me play differently from usual, its entertaining.