In Bernadette's own words, what happened during the first apparition on February 11th 1858, from Catholic Online - Blessed Mother Mary - Apparitions of Our Lady of Lourdes:
"'I had just begun to take off my first stocking when suddenly I heard a great noise like the sound of a storm. I looked to the right and to the left, under the trees of the river, but nothing moved; I thought I was mistaken. I went on taking off my shoes and stockings, when I heard a fresh noise like the first. Then I was frightened and stood straight up. I lost all power of speech and thought when, turning my head toward the grotto, I saw at one of the openings of the rock a bush - only one - moving as if it were very windy. Almost at the same time, there came out of the interior of the grotto a golden coloured cloud, and soon after a Lady, young and beautiful, exceedingly beautiful, the like of whom I had never seen before, came and placed herself at the entrance of the opening, above the rose bush. She looked at me immediately, smiled at me and signed to me to advance, as if She had been my Mother. All fear had left me, but I seemed to know no longer where I was. I rubbed my eyes, I shut them, I opened them; but the Lady was still there continuing to smile at me and making me understand that I was not mistaken. Without thinking of what I was doing I took my Rosary in my hands and went on my knees. The Lady made with Her head a sign of approval and Herself took into Her hands a Rosary which hung on Her right arm. When I attempted to begin the Rosary and tried to lift my hand to my forehead, my arm remained paralysed, and it was only after the Lady had signed Herself that I could do the same. The Lady left me to pray all alone; She passed the beads of Her Rosary between Her fingers but She said nothing; only at the end of each decade did She say the Gloria with me.
'When the recitation of the Rosary was finished, the Lady returned to the interior of the rock."