The Yankees, it would seem, go into battles as they would go into water, with life-preservers on. We have had exhibited to us one of these steel breast-plates found on the persons of prisoners, and taken from the dead bodies of the slain. It is in the shape of the two breasts of a vest, and is made up in its folds, being sewed between the cloth and the lining. Except by its stiffness, and weight, which is about three pounds, it has all the appearance of an ordinary waistcoat. These steel waistcoats are manufactured in New York, and are quite in vogue in the Yankee army, especially among the officers. They are purchased at twenty five dollars apiece, and are warranted to repel a musket or pistol ball at ordinary range.