Oppugno Jinx

"Harry spun around to see Hermione pointing her wand at Ron, her expression wild: The little flock of birds was speeding like a hail of fat golden bullets toward Ron, who yelped and covered his face with his hands, but the birds attacked, pecking and clawing at every bit of flesh they could reach."

- Description

Oppugno directs an object or individual to attack the victim. This spell will cause conjured creatures under the control of the caster to attack the target.

Hermione Granger used this to set a flock of conjured canaries on Ron Weasley in 1996.

Etymology
Oppugno is Latin, meaning "assault".

Appearances

 * Harry Potter and the Half-Blood Prince