When did Dumbledore use the Patronus as a signal?

[Geoff Bannister]

No: HPFGUIDX 136972

--- In HPforGrownups at yahoogroups.com, "jmjklj" <kathryn-jones at c...> 
wrote:
>  When Tonks sends her Patronus as a signal in Ch. 8 of HBP, here is 
> Harry's response:  "Was that a Patronus?" asked Harry, who had seen 
> Dumbledore send messages like this.

-Kathryn:
> My question is: Exactly when did we see this?  I know on JKR's site 
in 
> the FAQ poll she answered that we had already seen this in GOF.  I 
> don't recall any scene where that was used.  Could someone refresh  
my 
> memory?

Geoff:

Refreshment coming up.....

'Harry and Dumbledore hurried forwards. Krum was sprawled on the 
Forest floor. He seemed to be unconscious. There was no sign at all 
of Mr. Crouch. Dumbledore bent over Krum and gently lifted one of his 
eyelids.
"Stunned," he said softly. His half-moon glasses glittered in the 
wandlight as he peered around at the surrounding trees.
"Should I go and get someone?" said Harry. "Madam Pomfrey?"
"No," said Dumbledore swiftly, "Stay here."
He raised his wand into the air and pointed it in the direction of 
Hagrid's cabin. Harry saw something silvery dart out of it and streak 
away through the trees like a ghostly bird.'

(GOF "The Madness of Mr. Crouch" p.486 UK edition)