Campaign Builder. How to effect a campaign failure / ending in ANY stage of a campaign?

[Hippo]

Let's say I'm working on a campaign with ten stages, and in a mission in stage five I wish a certain event to cause the campaign to (abruptly) end in failure (or success).  How would I implement this?

The DCS manual is rather vague, p.364 :

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Failed final image. Clicking on the SELECT IMAGE field opens a standard file selection window in which you can select an image (*.jpg; *.jpeg; *.png) to be displayed upon failure to complete the campaign. The image must be 512х512 pixels in size.

However, it does not explain what "failure to complete the campaign" means in practical terms.

On p. 365,

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From the start stage field, you may set the starting stage for the campaign. You generally will not want to start the campaign on stage 1 in case the player loses the first mission and subsequently loses the campaign! The starting stage for the campaign will be marked with an asterisk (*) on the stage listing.

This appears to imply that the only way a campaign can end in failure is if a mission gets a score below 50 in the first stage.  And, conversely, that a campaign can only end in success if a score over 50 is achieved in the last stage.  Tell me it ain't so.  Please.

 

Edited 1 hour ago by Hippo