One Captain Don Juan de Aila went to Spain in the year 1687, in his own vessel, to procure additional forces and ammunition for the garrison at St. Augustine. He received the men and munitions desired; and as a reward for his diligence and patriotism, he also received the privilege of carrying merchandise, duty free; being also allowed to take twelve Spanish negroes for the cultivation of the fields of Florida, of whom it is said there was a great want in that province. By a mischance, he was only able to carry one negro there, with the troops and other cargo, and was received in the city with universal joy. This was the first occasion of the reception of African slaves; although as has been heretofore mentioned, it was made a part of the royal stipulation with Menendez, that he should bring over five hundred negro slaves.
Don Diego de Quiroga y Losada, the governor of Florida in 1690, finding that the sea was making dangerous encroachments upon the shores of the town, and had reached even the houses, threatening to swallow them up, and render useless the fort which had cost so much to put in the state of completion in which it then was, called a public meeting of the chief men and citizens of the place, and proposed to them that in order to escape the danger which menaced them, and to restrain the force of the sea, they should construct a wall, which should run from the castle and cover and protect the city from all danger of the sea. The inhabitants not only approved of his proposal, but began the work with so much zeal, that the soldiers gave more than seventeen hundred dollars of their wages, although they were very much behind, not having been paid in six years; with which the governor began to make the necessary preparations, and sent forward a dispatch to the home government upon the subject.
The council of war of the Indies approved, in the following year, of the work of the sea wall, and directed the viceroy of New Spain to furnish ten thousand dollars for it, and directed that a plan and estimate of the work should be forwarded. Quiroga was succeeded in the governorship of Florida, by Don Laureano de Torres, who went forward with the work of the sea wall, and received for this purpose the means furnished by the soldiers, and one thousand dollars more, which they offered besides the two thousand dollars, and likewise six thousand dollars which had come from New Spain, remitted by the viceroy, Count de Galleo, for the purpose of building a tower, as a look-out to observe the surrounding Indian settlements. Whether this tower was erected, or where, we have no certain knowledge. The towers erected on the governor's palace and at the northeast angle of the fort, were intended as look-outs both sea and landward.