“Where are you going?” asked Ron
“If we’re staying, we should put some protective enchantments around the place,” se replied, and raising her wand, she began to walk in a wide circle around Harry and Ron, murmuring incantations as she went. Harry saw little disturbances in the surrounding air: It was as if Hermione had cast a heat haze upon their clearing.
“Salvio Hexia… Protego Totalum… Repello Muggletum… Muffliato…”
(Harry Potter and the Deathly Hallows - Chapter 14; The Thief)