_August 12th._--A fine moonlight night. About 3·30 A.M. the enemy suddenly commenced a very heavy fire of round shot and musketry, which lasted for three-quarters of an hour. We kept close, and hardly fired a shot, beyond throwing a few shells. At day light, they commenced a very heavy cannonade and musketry fire on the Cawnpore battery; this gradually became so sharp, that it was impossible to work our guns, or even remain in the battery; and we were obliged to withdraw every one but the sentry, as the enemy's round shot had destroyed our musketry shutters, and completely swept the battery: later in the day, our sentry, the only man in the battery, was killed by a round shot. This portion of our position caused us great anxiety, as we were quite unable to hold it as it should be held; we would not withdraw our guns, for fear of giving the enemy confidence. The enemy were busily employed to-day also in digging close to Sago's house. In order to see what they were about, at 12 o'clock a sortie was made with twelve Europeans of the 32nd Foot under Lieutenant Clery, accompanied by Lieutenant Hutchinson of the Engineers. The enemy were, however, well on the alert, and had a large covering party over their work, and as our men appeared, they threw in such a heavy fire that our people were compelled to retire; this brought on a very great fire from all that side of the enemy's attack, and they kept up a smart fire of round shot and musketry for fully an hour, when it gradually subsided. Finding we were unequal to meet the enemy by a sortie, we determined to push on our mine as fast as possible, and continue working all day and night, hoping to blow them up. In the evening we had as strong working parties of Europeans as we could afford, and removed from the Cawnpore battery, a 9-pounder which had been disabled by a round shot of the enemy. We also dug a trench and threw up earth on the top of our parapets, and endeavoured to our utmost to repair the damage the enemy had done, and make the place as strong as possible. Several shells came in after dusk. The heat throughout the day was excessive, and there were several fatal cases of cholera, and also several deaths among the children, who were all greatly emaciated. In the evening, a letter to General Havelock, rolled up and put inside a quill, was despatched by the hands of an old woman; she left our position about 9 P.M., and we hoped, would be permitted to pass the enemy's sentries without being stopped. During the past forty-five days, we had sent by different hands, in a similar manner, some twenty letters, to only one of which was any reply received. The garrison, very greatly harassed and fatigued from continued exertion night and day and want of rest. _August 13th._--An excessively hot night. During the early part of the morning the enemy threw in a very heavy fire, which lasted for nearly half an hour, when all subsided into the usual routine firing.