by sigmazero13
Pretty close, but not quite: it's even better for the defender in this case that you guess!Units that are already routed before the battle are not added to the battle. So when the battle starts, the sides are:
- Defender: 0 units
- Attacker: 1 unit.
If the defender plays Summon Lightning, the defender has no units to damage. So it doesn't matter what units the Defender had that were already routed, they aren't in the battle and thus are not affected.
So the single attacking unit would take 4 damage (likely killing it), and the defender would win by default (as it would be tied for strength, 0 to 0), barring any modifiers.
This is an example why you should always bring in more than you think you'll need, even if the defense has "no units".
The same would apply if the attacker attacked an empty stronghold, too; so if the attacker brought in "just enough" to beat the stronghold, the Summon Lightning would create a major hitch!