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Phineas Nigellus's portrait at the Hogwarts headmaster office said this near the very end of the seventh book.

This quote may refer to Severus Snape's actions that were vital to ending the war.

Akojen--While I find the above answer most likely and agree with Snape's absolutely vital role, I would like to add that Phineas Nigellus, a rather proud Slytherin, was quite useful when it came to running messages for Dumbledore between portraits, both before and after Dumbledore's death.  He provided (in the book) the crucial information that Snape needed to know where to place the Sword of Gryffindor, as well.

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