Yes, actually. In 1346, John, King of Bohemia, accompanied his ally, Philip VI, King of France, to the Battle of Crecy. At this time, John was fifty, and had been blind for some ten years. Prior to this, he had been a skilled warrior, and despite his blindness, was entrusted with command of troops. At a critical point in the battle, he called upon his knights to lash their horses to his and lead him into the thick of the fighting. They went forward together, into the press, and were killed to a man and found lying in a group, their horses still tied together. Froissart describes it as such:

...for all that he was nigh blind, when he understood the order of the battle, he said to them about him: 'Where is the lord Charles my son?' His men said: 'Sir, we cannot tell; we think he be fighting.' Then he said: 'Sirs, ye are my men, my companions and friends in this journey: I require you bring me so far forward, that I may strike one stroke with my sword.' They said they would do his commandment, and to the intent that they should not lose him in the press, they tied all their reins of their bridles each to other and set the king before to accomplish his desire, and so they went on their enemies. The lord Charles of Bohemia his son, who wrote himself king of Almaine and bare the arms, he came in good order to the battle; but when he saw that the matter went awry on their party, he departed, I cannot tell you which way. The king his father was so far forward that he strake a stroke with his sword, yea and more than four, and fought valiantly and so did his company; and they adventured themselves so forward, that they were there all slain, and the next day they were found in the place about the king, and all their horses tied each to other.