This is how I do the bear trap. Hope it helps you.

Before You Start

  • Set up Squads
    • ^^^ -> This makes a huge difference - faster rally joins with correct heros
  • Give your best gear to Jessie

Joining Rallies

Starting Rallies

  • Only when starting Rally, use your three strongest heroes
  • For rallies I start, I send few troops (5/5/10)
    • So that most of my troops join rallies, which happens more often

Please Do Not

  • If you are far away from the bear trap, do not start rallies
  • Do not start other rallies during bear trap