The men were stationed in a series of camps. The best of all these was probably at Point Isabel, where the dry, undulating ground and fresh breezes made for health and comfort. Fort Polk, as the station was now called, included about fifty acres. The shallowness of the harbor impaired the convenience of the Point somewhat, however; and the primary camp lay three or four miles away at the north end of Brazos Island, which consisted of low hills on the side toward the mainland, a swamp in the centre, a wreck-strewn beach on the outer side, and in general three blades of grass to fifty square feet of sand, as Lieutenant George B. McClellan wrote home. Here, too, the air was excellent; but the brackish water caused many complaints, and the sand blew into everything--hair, nose, eyes and food. Marching the entire length of the island the soldiers found themselves, at its southern end, about eighty yards from the mainland, waded across the bayou or strait known as Boca Chica, and after going about seven miles farther came to another camp and group of storehouses, ten miles or so from their point of departure, called Mouth of the Rio Grande, where the river steamers tied up or anchored.[10.5] Here, as at Camp Brazos, the ground was "working A live with magotes and land crabs," as a soldier put it; but the same breezes usually tempered the heat. Eight miles from the Gulf by land--twenty-five or thirty by water--one came to Burrita, a cluster of huts on a ridge close to the stream, and this high ground was made the site of a roomy camp. On the opposite side of the river and separated from it by a mile of swamp lay Camp Belknap, a spot fit only for the snakes, tarantulas, centipedes, fleas, scorpions and ants that infested it. Above this point lay several more camps,[10.6] and still others enveloped Matamoros.[10.7] Except Belknap all of these places were fairly salubrious for men of reasonable prudence, and several of them distinctly healthful; yet considerable sickness prevailed. At Brazos Island a sort of dysentery made trouble, and by some the water of the Rio Grande itself was thought injurious. Until May 13 no funds available for tents had been within the reach of Quartermaster General Jesup; and after this difficulty was removed, feeling that he could not wait for duck, he used, common muslin, which let the rain through; and many of the troops, even regulars, had no protection against the weather except a screen of brush or a blanket thrown over a bush. Measles invaded the camps, and lying on the damp ground made the disease fatal in many instances. What was worse, the heedlessness and homesickness of the volunteers caused much sickness even at Point Isabel. The regulars, however, were comparatively healthy and contented.[10.7]