message: Reduce Skirmisher retreat chance and collateral damage
diff: <iXPValueAttack>4</iXPValueAttack>
  <iXPValueDefense>2</iXPValueDefense>
  <iFirstStrikes>1</iFirstStrikes>
  - <iWithdrawalProb>50</iWithdrawalProb>
  - <iCollateralDamage>100</iCollateralDamage>
  + <iWithdrawalProb>30</iWithdrawalProb>
  + <iCollateralDamage>50</iCollateralDamage>
  <iCollateralDamageLimit>25</iCollateralDamageLimit>
  <iCollateralDamageMaxUnits>2</iCollateralDamageMaxUnits>
  <iHillsAttack>25</iHillsAttack>
  <iXPValueDefense>2</iXPValueDefense>
  <iFirstStrikes>1</iFirstStrikes>
  <iWithdrawalProb>50</iWithdrawalProb>
  - <iCollateralDamage>100</iCollateralDamage>
  + <iCollateralDamage>50</iCollateralDamage>
  <iCollateralDamageLimit>25</iCollateralDamageLimit>
  <iCollateralDamageMaxUnits>2</iCollateralDamageMaxUnits>
  <iHillsAttack>25</iHillsAttack>
  