message: Artillery and Howitzer: +25% against Siege units
diff: <iCollateralDamageLimit>60</iCollateralDamageLimit>
  <iCollateralDamageMaxUnits>6</iCollateralDamageMaxUnits>
  <iCityAttack>25</iCityAttack>
  + <UnitCombatMods>
  + <UnitCombatMod>
  + <UnitCombatType>UNITCOMBAT_SIEGE</UnitCombatType>
  + <iUnitCombatMod>25</iUnitCombatMod>
  + </UnitCombatMod>
  + </UnitCombatMods>
  <UnitCombatCollateralImmunes>
  <UnitCombatCollateralImmune>
  <UnitCombatType>UNITCOMBAT_SIEGE</UnitCombatType>
  <iCollateralDamageLimit>70</iCollateralDamageLimit>
  <iCollateralDamageMaxUnits>7</iCollateralDamageMaxUnits>
  <iCityAttack>25</iCityAttack>
  + <UnitCombatMods>
  + <UnitCombatMod>
  + <UnitCombatType>UNITCOMBAT_SIEGE</UnitCombatType>
  + <iUnitCombatMod>25</iUnitCombatMod>
  + </UnitCombatMod>
  + </UnitCombatMods>
  <UnitCombatCollateralImmunes>
  <UnitCombatCollateralImmune>
  <UnitCombatType>UNITCOMBAT_SIEGE</UnitCombatType>
  