The circumstances in which this fever first made its appearance were as follows: When the army landed at Siboney it found there a dirty little Cuban village of from twelve to twenty deserted houses, situated at the bottom of a wedge-shaped cleft in the long, rocky rampart which forms the coast-line between Siboney and Morro Castle, and at the mouth of a low, swampy, malarious ravine or valley extending back into the foot-hills, and opening upon the sea through the notch. The site of the village, from a sanitary point of view, was a very bad one, not only because it was low and confined, but because in the valley immediately back of it there were a number of stagnant, foul-smelling ponds and pools, half overgrown with rank tropical vegetation, and so full of decaying organic matter that when I passed them for the first time on my way to the front I instinctively held my breath as much as possible because the very air from them seemed poisonous. The houses of the village, as a result of long neglect, had become as objectionable from a sanitary point of view as the location in which they stood. They were rather large, well-built, one-story frame houses with zinc roofs, and were erected, if I mistake not, by the Spanish-American Iron Company for the accommodation of its native employees. Originally they must have been very commodious and comfortable buildings, but through the neglect and untidiness of their later occupants they had become so dirty that no self-respecting human being would be willing to live in them.
Such were the village and the houses of Siboney when the army landed there on June 23. In view of the nature of the Cuban climate during the rainy season, and the danger of infection from abandoned houses whose history was entirely unknown, and within whose walls there might have been yellow fever, it was obviously somebody's duty not only to clean up the place as far as possible, but to decide whether the houses should be burned to the ground as probable sources of infection, or, on the other hand, washed out, fumigated, and used. The surgeons of the blockading fleet recommended that the buildings be destroyed, for the reason that if Siboney were to be the army's base of supplies it would be imprudent to run the risk of infection by allowing them to be used. Instead of acting upon this advice, however, the army officers in command at Siboney not only allowed the houses to be occupied from the very first, but put men into them without either disinfecting them or cleaning their dirty floors. Chlorid of lime was not used anywhere, and the foul privies immediately back of and adjoining the houses were permitted to stand in the condition in which they were found, so that the daily rains washed the excrement from them down under the floors to saturate further the already contaminated soil.