Alexander Carl Friedrich von Arentschildt, Instructions for Officers and Non-Commissioned Officers of Cavalry…
“ When a Vidette discovers anything suspicious on the side of the enemy, should it be a rising dust or the glittering of arms, he should move his horse in a circle at a walk. The Officer should instantly proceed to the Vidette, accompanied by a corporal and four men, and if he cannot distinctly discover by his spy-glass the cause of the dust, he should send off the men that accompanied him, as a Patrol, or go himself; so far that he can report in case he sees Troops, how strong they are, whether consisting of Cavalry, Infantry, or Artillery, but particularly in which direction they march. ”
