What does she mean by "vanquish"?

[Florentine Maier]

No: HPFGUIDX 70131

Hi together,

I've been trying to analyze the prophecy for a few days, and I've 
already come up with an interpretation (see post #69857), but I'm 
still not conviced of it 100% myself.
   Since I'm not a native speaker, I don't have the feel for the 
language to know if what I'm thinking is actually possible.

I'm wondering if the verb "vanquish" can be used with a noun clause...
Like:
"The one with the power to vanquish the Dark Lord approaches..."
meaning:
"The one with the power to vanquish (meaning prevent) THAT the Dark 
Lord approaches"
Or:
"the one with the power to vanquish the Dark Lord will be born as the 
seventh month dies ... "
meaning:
"the one with the power to vanquish THAT the Dark Lord will be born 
as the seventh month dies ... "

I'd be really grateful you as a native speaker of English could give 
me your opinion on this usage of the word.

Florentine