I don't know where to put this but it is too good not to post.
Quoted from...
Leander Stillwell
The Story of a Common Soldier of Army Life in the Civil War, 1861-1865
We therefore bivouacked at the point where we stopped until the next morning. Soon after the halt a hard rain began falling, and lasted all afternoon. We had no shelter, and just had to take it, and "let it rain." But it was in the middle of the summer, the weather was hot, and the boys stood around, some crowing like chickens, and others quacking like ducks, and really seemed to rather enjoy the situation. About the only drawback resulting from our being caught out in the summer rains was the fact that the water would rust our muskets. In our time we were required to keep all their metal parts (except the butt-plate) as bright and shining as new silver dollars. I have put in many an hour working on my gun with an old rag and powdered dirt, and a corncob, or pine stick, polishing the barrel, the bands, lock-plate, and trigger-guard, until they were fit to pass inspection. The inside of the barrel we would keep clean by the use of a greased wiper and plenty of hot water. In doing this, we would ordinarily, with our screw-drivers, take the gun to pieces, and remove from the stock all metallic parts. I never had any head for machinery, of any kind, but, from sheer necessity, did acquire enough of the faculty to take apart, and put together, an army musket,—and that is about the full extent of my ability in that line. We soon learned to take care of our pieces in a rain by thoroughly greasing them with a piece of bacon, which would largely prevent rust from striking in. We resumed our march to Bolivar early in the morning of the 18th.
Stillwell, Leander (2011-03-17). The Story of a Common Soldier of Army Life in the Civil War, 1861-1865 (pp. 90-91). . Kindle Edition.