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
- Use Correct Heros
- Marksmen give you the most points
- good troop ratio: 10/10/80
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