I decided to give this short guide of Tribe tactics when trying to get your scalp. This is due to increased demand by Mr. Puggels and his rewards. So if you live in tribal lands and don't have your own village yet this is for you. I write this from my own experiment and am noob myself regarding to PvP area of the game.
1st priority is to get the silver for village bell and fence the perimeter. Without that you're never really safe (and only get 24h warning with those).
You should also bring alt/alts at your claim for scouting. Also build a fully fenced area inside your claim.
Telltales of tribal influence - steps
Phase 1) Initial appearance - these may not be related to tribe but be cautious
-There's suddenly an unidentified occupied leanto near your claim
-A guy with noob clothes wanders near your claim and may start a conversation: "Hi, I was just spawned here by wilderness guide" or similar to mislead you
He tells you he just learns the game
Phase 2) Scouting/scent fishing
-That "noob" you saw yesterday lies KOed inside your claim (he said he's noob but got trespassing already!!)
Whatever you do, don't loot or kill him! - you only leave scents (he may have a pioneer jacket or other nice things to lure you)
Send him to his homestead and run to nearby leanto to see if he spawns there (you have only a short time period to check that)
If he does - claim that leanto and destroy it (no scents)
Phase 3) Preparations for raid (by now extreme caution is advisable outside your walls)
-When you log in, a lonely guy in noobish clothes stands outside your borders (can't log out due to crime debuff)
-Parts of walls are missing, some are damaged - 3 empty braziers in a row have appeared inside your claim (to nerf your own brazier fire)
(This phase is for bringing down your defences)
-If you open gates and try to repair walls / destroy empty braziers, red dots appear at your minimap - run immediately inside your fenced area and observe/port to Providence
Phase 4) Scalping
-Guys in admirals jackets and feather headdresses try to mislead you to join their party or negotiate for your life
They are only trying to convince you to stay there for scalping. Their trustworthiness is questionable at best. After you cancel party requests they try to direct you to forums to read PMs or screenshots. If you have your defences up you may stay online and observe the situation (stay away from stomp area of influence!). Otherwise log out to Providence and do not port back home (it may be village claimed and you will get stuck there and scalped).
Hope this saves some scalps during these hard times we are experiencing..