Jacob Grimm and Wilhelm Grimm

“ On the other side of the lake stood a fine illuminated castle, from which came the merry music of horns and trumpets. There they all landed, and went into the castle, and each prince danced with his princess. ”

“ The soldier, who was all the time invisible, danced with them too, and when any of the princesses had a cup of wine set by her, he drank it all up, so that when she put the cup to her mouth it was empty. At this, too, the youngest sister was terribly frightened, but the eldest always silenced her. They danced on till three o'clock in the morning, and then all their shoes were worn out, so that they were obliged to leave off. The princes rowed them back again over the lake, but this time the soldier placed himself in the boat with the eldest princess. ”

“ Only take care not to drink any of the wine that one of the princesses will bring to you in the evening, and as soon as she leaves, pretend to be fast asleep." Then she gave him a cloak, and said,
"As soon as you put that on you will become invisible, and you will then be able to follow the princesses wherever they go." When the soldier heard all this good counsel, he determined to try his luck: so he went to the king, and said he was willing to undertake the task. ”