I'm not kidding, they're basically uh, fodder of FE:LH 
Rare times where Darklings manage to get an good advantage over their enemies, they lose anyways.
Such particular incident happened where my Ericridge's army was battling off a group of invading monsters to keep them off my first Fortress, it was just four units including Ericridge and I wanted it at full strength and got a Spearmen unit to reinforce it from my Fortress ..
So I have one start marching through the route that was recently cleared out by Ericridge's army. But somehow .. I missed a single small Darkling army. It ambushed my footmen successfully I was like.. oh shit well imma do as much damage as I can before I go down 
But as the footmen closed range and started battling, and managed to get at least one Impale attack off striking two darkling units.
As you can see.. I emerged victorious 
Poor darklings, I think they only can beat up level 1 human units that got trained out of a town 
