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

[Spart]

you forget to press the pause button before going to the loo and the battle is going to decide the control of your last city

[TruePraetorian]

You are the most adept swordsmen on the planet, you belong to a company of soldiers even a spartan looks small to, you have the greatest of all great generals commanding you...

Spoiler Alert, click show to read: 

And the enemy rolls up in an M1A2 Abrahms

[georgeman51]

when warband is 2 units of leginaries

[nara shikamaru]

When your adviser give you his resignation, and asks for a letter of recommendation for your enemy.

[Barbarian]

When, after a decisive battle, you wake up in a camp, which is full of people, who talk in some strange foreign language.

[Ibrahim]

When, after a decisive battle, you wake up in a camp, which is full of people, who talk in some strange foreign language.

Question: suppose you were Seleukid fighting Ptolemaioi? both spoke Greek.

well, one knows when they lose the battle when one of the following occur:

1-one finds he's cowering behind the capital's wall, and under a bunker and commits suicide with Cyanide and a pistol .
2-your best general's head is on the lance of a pantodapoi, or other peasant.
3-your city/ best army is now a crater.
4-when ten stacks of one's best soldiers are slaughtered by a single UNIT of inepreienced and untrained patodapoi/ peasants. .
5-the leader wakes up (or dug up) after a decisive batlle and hears tanze-metal.
6-Khalid ibn-alwalid is your enemy (see wikipedia).
7-I'm your enemy .
8-the 300 are your enemy.
9-the death star is your enemy.
10-Dick Chaney is appointed advisor.
11-one has sligers and the enemy has Tiger tanks or M1A1 Abrams tanks.
12-the leader requested a red shirt and brown pants with a gold front.
13-when you have an appointment with Armin Meiwes (look up on wikipedia too).
14-you hear the breathing of darth Vader.

[Mikeus Caesar]

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

You see the defeat screen.