Although Sanchez was in charge of the work and was responsible for it, Mazariegos spent much of his time there, watching it, directing it, and chastising with tongue and sometimes even with rod all who seemed laggards at the job. In time he succeeded Sanchez in authority. For Sanchez incurred much enmity on the part of some influential citizens, whose houses he took in order to make an open place about the fort. They accused him of corruption, of making gross errors in the plans for the fort, of fomenting discord, and of wasting money. He was too busy with building the fort to pay much attention to these things, even when they took the form of letters to the King. The outcome of it was that in the summer of 1560 Sanchez was removed from his place, and Mazariegos was put in charge of the completion of La Fuerza. A few months later Sanchez reached Seville, and pleaded his case to so good effect that the crown was convinced that injustice had been done him, and that he should not have been discharged. However, it was not practicable to reinstate him, though he was sent back a few years later to make an official inspection of the completed fort. In addition to La Fuerza, Mazariegos built the first forerunner of the Morro Castle. In 1563 he built on the Morro headland a tower of masonry more than thirty feet high. It was intended primarily as a landmark, and was therefore painted white in order to make it visible at the greatest possible distance. But a watchman was generally kept in it, to espy approaching vessels and to signal to the city news of their approach. The tower is said to have cost only 200 pesos, and was paid for by the city of Havana.