Within twenty miles of Cienfuegos, among the mountains, there has numbered a force of rebels somewhere in the vicinity of twelve thousand. Their movements show both strategy and strength--their mode of warfare the guerilla. Over a month since four hundred troops were landed here from Spain, and shortly afterward ordered into an engagement, or to make an attack upon the insurgents. They were not regulars--some of them beardless youths. When the fray was over, it is said but one escaped, because he had a better horse than his pursuers. The destruction of this force was only a before-breakfast pastime for the rebels. They are now constantly making incursions upon the planters, firing fields of cane, sugar-mills, and, before the work of destruction is half finished, they are miles away, strewing desolation wherever they pass. The Cuban rebellion is no longer of infantile growth; the entire inefficiency of the volunteers, who go racing about the country, is plainly to be seen. Every thing pertaining to military movements is shrouded with an air of mystery. When the wounded and dying are brought in on the cars, guards are placed at the doors--no person but surgeons admitted, no questions answered, or satisfaction given to outsiders. It is shocking to see a country of such luxuriance and beauty fall a prey to the unrelenting hand of war, which gluts itself with human gore, and is only satiated when the fiend of destruction has no more blood to shed, or conquests to make. "La Purisima Conception" is the name of the only church in the city. It has two towers and ten bells. The tallest tower was erected to contain a clock, and afterward the church was built around it, thus rendering the style of architecture any thing but imposing. The materials used are stone and brick, with marble floors. It is singular to see a people among whose progenitors in Spain the Christian religion was first planted by the apostles themselves, cherish so little zeal in regard to the observance of its ordinances in any way. The congregation outside is larger than the number of worshipers inside, on Sabbath morning. The men stand about the entrance, and make remarks about those going into church, as though they were engaged in the path of duty. Their conduct is a reminder that the chivalric days of elegant address and lordly demeanor are passing away from the Spanish people who reside this side of the water. At 8 o'clock A.M. the best society residents come out to worship. In a population of ten thousand souls a goodly number might be expected to witness the imposing ceremonial of a high mass on Sabbath morning. The church has an elegant interior, the architecture being Doric, the arched roof supported by numerous pilasters. At the terminus of the nave is placed the grand altar, ornamented with images of dazzling brightness and golden candlesticks of gigantic proportions, containing immense wax candles, which, when lighted, shed a star-like luster.