The Shoes that Were Danced to Pieces

One king had twelve beautiful daughters who slept all together in one chamber. Each evening the king would lock their room and each morning he would find them with shoes danced to pieces. Was there someone willing to solve the riddle? The king was going to give both his kingdom and one of his daughters to the man who dared to find out the answer. Many tried and many failed. One poor soldier who had nothing to lose decided to try his luck.
Will he succeed? You can never know if you don't read "The Shoes that Were Danced to Pieces".