nd (or officer of the day, or etc.) with the
countersign"; then "Advance, friend (or officer of the day, or
etc.)."

193. If two or more persons approach a sentinel's post from different
directions at the same time, all such persons are challenged in
turn and required to halt and to remain halted until advanced.

The senior is first advanced, in accordance with the foregoing
rules.

194. If a party is already advanced and in communication with
a sentinel, the latter will challenge any other party that may
approach; if the party challenged be senior to the one already
on his post, the sentinel will advance the new party at once. The
senior may allow him to advance any or all of the other parties;
otherwise the sentinel will not advance any of them until the
senior leaves him. He will then advance the senior only of the
remaining parties, and so on.

195. The following order of rank will govern a sentinel in advancing
different persons or parties approaching his post: Commanding
officers, officer of the day, officer of the guard, officers,
patrols, reliefs, noncommissioned officers of the guard in order
of rank, friends.

196. A sentinel will never allow himself to be surprised, nor
permit two parties to advance upon him at the same time.

197. If no countersign be used, the rules for challenging are the
same. The rules for advancing parties are modified only as follows:
Instead of saying "Advance (so-and-so) with the countersign,"
the sentinel will say; "Advance (so-and-so) to be recognized."
Upon recognition he will say, "Advance (so-and-so)."

198. Answers to a sentinel's challenge intended to confuse or
mislead him are prohibited, but the use of such an answer as
"Friends with the countersign," is not to be understood as
misleading, but as the usual answer made by officers, patrol,
etc., when the purpose of their visit makes it desirable that
their official capacity should not be announced.

SPECIAL ORDERS FOR SENTINELS AT THE POST OF THE GUARD.

199. Sentinels posted at the guard will be required to memorize
the following:

Between reveille and retreat to turn out the guard for all persons
designated by the commanding officer, for all colors or standards
not cased, and in time of war for all armed parties approaching
my post, except troops at drill and reliefs and detachments of
the guard.

At night after challenging any person or party, to advance no
one but call the corporal of the guard, repeati