When we reached Nicaragua, in the latter part of December, 1856, the entire force of the filibusters was still in Rivas, with the exception of a small party stationed on the Rio San Juan, beyond the lake, and communicating with the Isthmus force only by means of two small steamers, "La Vírgen" and "San Cárlos," which plied across the lake between the head of the river and Virgin Bay, on the California passenger-line. The allies had remained inactive at Granada, and were said to be broken into factions, and daily deserting and returning home in large bodies. The isthmus of Rivas was free ground to the filibusters, and a score of rangers might forage with little danger from the Costa Rican line almost to Granada. Their force outside of the hospital, as we saw it at head-quarters, numbered probably from eight hundred to one thousand men,--one-third mere skeletons, scarcely able to go through drill on the _plaza_,--fit only to bury,--and the great majority of the remainder turning yellow, shaken daily by chills and fever, and soon to be as worthless as the others. They were all foreigners,--Americans, Germans, Irish, French, and English,--with the exception of one small company of natives, captained by a half-breed Mexican. It was said, however, that many of the poorer natives were willing to fight against the Chamorristas,--the aristocratic Nicaraguan faction originally opposed to Patricio Rivas and the Liberals, now in arms against General Walker,--but that they made miserable soldiers outside of a barricade, and General Walker had no arms to throw away upon them. For sustenance, the filibusters had the fruits around Rivas, and a small ration of tortillas and beef, furnished them daily by Walker's commissary. The beef, as we heard, was supplied by Señor Pineda, General Walker's most powerful and faithful friend amongst the natives; and the tortillas were bought from the native women in the neighborhood of Rivas. It was the quality of the food--assisted largely by exposure, irregular fasts, and _aguardiente_--which made Nicaragua so fatal to the filibusters. The isthmus between the lake and the Pacific, swept nine months of the year by cool eastern breezes, is not unhealthy. But the ration of beef and tortillas (simple maize cakes without salt) was too scanty and intermittent; and in the absence of proper food, the men were driven to fill their stomachs with the unwholesome fruits which everywhere surrounded their quarters, and but few were able to stand it many months.