Traveling about sixteen miles, we arrived at Buena Vista. After pitching our tents, we lay down supperless, for we had neither wood nor provisions. Scarcely had I fallen asleep, when the news was circulated that a mail had arrived. Soon after a letter was handed me from my friend Mrs. W., but, having no light, I was forced to postpone the reading till morning. We had scarcely finished our breakfast, when the long roll was beaten, calling us all to arms, as our picket guard had just arrived with the intelligence that the Mexican army was approaching. Having packed our wagon and formed a line, we were marched one and a-half miles towards the enemy, and stationed on a ridge just behind the narrow pass in which Major Washington’s battery was placed. There we waited the approach. The Mexicans had encamped the night before at Agua Nueva, causing the Kentucky and Arkansas cavalry, who were guarding some provisions, to destroy them and retreat in the night. We were greatly indebted to Colonel May and Captain M’Cullough, who rendered us much good service as spies. The intelligence which they brought caused us to leave the plains of Agua Nueva for a very strong and advantageous position.--Whilst we were awaiting the onset, I read Mrs. W.’s letter over and over again. It was encouraging, and afforded many topics for contemplation. Having remained in this position more than half the day, we were ordered over to another height on the left, near the foot of the mountain, where we were, during the night, occasionally receiving a shot from the enemy’s battery. (See Map, Letter D.) Toward evening, the two rifle companies, from each of the Indiana regiments, commanded by Major Gorman, who were stationed on the left, upon the side of the mountain, (see Map G,) were fired upon by an immense body of the enemy, who had also ascended the mountain. A heavy fire was kept up till dark, when all was silent, save the echoing of the enemy’s trumpets. I never shall forget the peculiar melody of those sounds as we lay upon our arms, hungry, and shivering with cold. It was a prelude to the awful din of next day.