So, in this case, considering they considered themselves the defenders of the greatest ideology of all time and the (worthy) people, and were at war with both foreign countries and some of their own people, I’d say it'd mean something like:

"Committee in charge of delivering the country, the Republic (the idea of Republic itself; not just it’s French incarnation) and freedom / democracy (even though they weren’t quite democratic) from utter ruin and certain doom"

But that’s quite a mouthful.