You know when you have lost the war when...

[Motep]

...When your king and your heir are both killed by wardogs in one battle
...When you lose a battle to an army with "Arses" in command
...When you fight against Motep
...When you are allied to Motep ( )
...When you are an ally of a nation fighting Motep

[Ayachuco]

when your vast horde of spearman cannon fodder from the bronze age destroys one tank. And that tank belonged to Ghandi who lives on top of a mountain fortress. And Ghandi is the only one who has the uranium resource and you built the Manhattan Project to try to nuke Ghandi out of there.
Curse you, Ghandi!!! (on Diety level from Civilization II)