along the lines of misdirection, appearing meek or cowardly (fracturing or staggering your troops) to appear less of a threat has its uses. Then so does standing tall, looking fierce (extra campfires, drummers, and keeping an empty ness in the center of troop formations to appear a larger force) and seemingly unafraid and welcoming confrontation has its uses as well. all the varying tactics will have a time and place.
awareness and possessing the mental faculties to assess and adress the varying circumstances and contributing factors is, IMO, one of the most important elements in being able to determine what route you want to take in defending, evading or avoiding possible confrontations.
with that said, from my point of view, sometimes its a good idea to let someone know what they are getting themselves into, some people just have no clue, and when they realize you're gonna put out your A game, they may have a change of intentions. other times, its good to let someone over zealous to assume you are a weak pushover. alot of that is being able to discerne personality type and intent as well though.
ugh had to go on lunch and lost my train of thought....
For whoso comes amongst many shall one day find that no one man is by so far the mightiest of all.