And this from a battery at the Battle of Chancellorsville:
"The next day we reached Kelly's Ford early in the afternoon, and went into camp, preserving the utmost silence, all orders being given by word of mouth without drum-beat or bugle signal, and the men were not permitted to show themselves on the bank. The value of these precautions was shown by the fact that we took the enemy entirely by surprise; a detachment from Steinwehr's Division crossed the river, drove the enemy out of the rifle pits, and occupied the opposite shore, and then, with great dispatch and success, the engineers laid down the pontoons, and, under cover of night, our whole Corps passed the river and gained the heights about half a mile back. This was a pretty hard job for the artillery as they sent us no guide to take us through the level swamp lying between the river and the hill; and we floundered about in mud and mire until nearly daybreak; two hours sleep, on a plank taken from a fence, and a wash in a dirty pool, quite refreshed me, and by six o'clock we stood in readiness to renew our march, now upon the south side of the Rappahannock."
Bringing the