Walker's forces consisted of about 1,200 effective men, mostly Americans, the rest being English, French, and Germans.[XVII-24] The climate was his worst enemy. A number of his men succumbed daily, victims of cholera and fever.[XVII-25] The ranks were further depleted by desertions.[XVII-26] This was one of the chief reasons why Walker abandoned Managua and Masaya to concentrate in Granada, keeping, however, the transit line from San Juan del Sur to La Vírgen. The filibuster chief now took advantage of the division of the allied forces—Belloso and Jerez in Masaya, Zavala and Estrada in Diriomo—and on the 11th of October made a dash with 800 men on Masaya, which had a garrison of 1,000. He entered the place at eight o'clock and took positions in Monimbó, south of the town. Early on the 12th he advanced as far as the blocks contiguous to the plaza, which he would undoubtedly have taken but for Zavala's attack on Granada.[XVII-27] On hearing of Walker's movement, Zavala started to the relief of Masaya. At Diriá he was informed that Walker was routed and in full retreat to Granada. He then changed his course, and turned up at the burying-ground of Granada with the view of getting the start of the enemy; but as the latter did not come, and he had positive information of the place being weak, he resolved to occupy it at once, though a heavy rain somewhat retarded the movement. He might have taken the town by surprise either from the north to south, but went round by Jalteva.[XVII-28] The allied force had not till then been detected from the city. But on the officer of the day descrying groups, he went to ascertain if they were Walker's men, and immediately giving the alarm, preparations were made to meet the expected assault. Nevertheless, the allies at two o'clock in the afternoon occupied the buildings on the plaza, excepting the church, where the foreign sick were intrenched. Zavala took Walker's house, and finding there a flag, rushed out waving it, until a bullet struck the flag, and another his surtout, when he realized his danger. Both the Guatemalans and legitimists gave themselves up to excesses.[XVII-29] The night of the 12th came on, and the church had not been taken. Hearing the cannonading or receiving a report, early that morning Walker hurried back, it being preferable to save Granada than to take Masaya. In the morning of the 13th, Zavala learned that the enemy was rapidly approaching, and vainly tried to check them at Jalteva. Zavala and Estrada fled in the direction of Diriomo, leaving a considerable number of drunken men in the streets, who were butchered. Several Guatemalans fell prisoners.[XVII-30] Zavala's assault of the place where Walker had his base of supplies was a failure, but it saved the allied army.[XVII-31] [Sidenote: VERY FAIR FIGHTING.]