Things that increase your chances of taking back the clearing:
- Defeating Sootleg
- Waspwing defeating Sootleg (The player defeating Sootleg is better though, because then Waspwing can focus on other cats.)
- Winning your other battles during the war.
- Recruiting Kestrelpaw to the Hawks.
- Telling Thrushfeather that Pebbleskip will be at the border.
- Telling Thrushfeather about a quest. (I'm not sure what quest.)
- Sending the rogues in the clearing to ShadowClan.
- Letting the Hawks carry out their mission on Day 6.
- Crossing the ShadowClan border and defeating the patrol that attacks you. (This is not easy. Probably not neccessary either, but if you want to try it, make sure you have an adequate party.)
- Making Nettleclaw hate you.
Things that decrease your chances of taking back the clearing:
- Raising the war progression too high (Causing the RiverClan ending, or ShadowClan going all out.)
- Meeting with Pebbleskip and giving him Ravenwing's apology.
- Telling Mousepaw that a Clanmate wanted to apologize. (Tell him you wanted to discuss a prophecy instead.)
- Getting Blackheart to give herbs to ShadowClan.
- Putting crowfood in the fresh-kill pile.
- Letting Kestrelpaw die, or making him hate you.
- Letting Nightkit or Eaglekit die.
- Failing to catch Magpieburr.
- Not completing the quest Legends Come to Life.
- Not dealing with the rogues in the clearing.
- Making Duskpaw hate you.
- Making Badgerpaw hate you.
- Making Thrushfeather dislike you.
Hope this helps.