Embarrassing barrage

[JPablo]

Is there some Veteran WWII expert, (or some Marine or Navy Officer for that matter) who can shed some light on the usage of "embarrassing barrage" as a Navy expression?

I found a couple of contexts where it may be just "an urgent barrage" dropped on a submarine, to "disconcert" the enemy, rather than to destroy it directly. Is that a correct perception, or it is just a "barrage" that embarrass the guys dropping it, as well as the receivers of it?

Example:
The Officer of The Deck had no time for evaluation; an embarrassing barrage was urgent to prevent a torpedo from finding its way into the merchant ship...

What would be a good Spanish translation?
Una descarga de urgencia
Una cortina de fuego de emergencia
Un bombardeo de desconcierto


Any views on this always welcome!