We arrived at this place, on last Saturday, to join General Taylor and Wool, who recently concentrated their forces here. It is generally believed that a movement is contemplated upon San Luis Potosi, or Zacatecas. It is quite cold in this elevated situation, and we have suffered exceedingly, especially within a few days. Last night was the first snow storm that I saw this winter. We use pitch-pine as wood, and chop it ourselves upon the mountains, six or seven miles from the camp, by the road. We now occupy the post of danger, and know not what is in store for us. So many reports have been in circulation, that we are almost indifferent to what we hear, no matter how startling it might appear. But if we march towards San Luis, we shall have what we have been so long craving--a fight. Recently I became sergeant, to fill the vacancy occasioned by Thomas Gwin being made sergeant-major. Being on guard to-night, these notes are written during the intervals of my duties; having a cold, and nursing my light, which is kept flickering by the howling wind without. It is nearly eleven, and time to awaken the second relief. _13th._--Last night I was so cold and uncomfortably situated, that I was incapable of holding my pen, but I have commenced early this morning, hoping to finish before my companions start away. There was rain last night, and it don’t seem so cold at present, but the mountains are still covered with snow. This place is truly romantic, and presents some of the finest prospects I ever beheld. There is the extended plain, dotted with white tents, and the huge mountain piles around excite the loftiest sentiments. If the gorgeousness of the sunsets could be transferred to canvas, the painter might be called a wild enthusiast. Dear sister, in sending you this journal, I am actuated by the expectation of a long and perilous march. It is well to dispense with all superfluous weight. Please take care of this till I return, if I should be so fortunate. I know not whether to ask you to continue writing, as it is doubtful whether your letters would be received. I shall hasten to apprize you of our next movement. Remember me to all my friends, my mother and brothers in particular. My fingers are so benumbed that I cannot write any more. _28th._--During last week, I have passed through so many thrilling scenes, that I am unable to describe them in regular order. Last Sunday we received orders to strike our tents and prepare to march. Before we had formed a line, and the command given, “file left,” the most of us were ignorant of our place of destination. But so soon as we commenced marching towards Saltillo, there was an end of discussion.