message: Reduce Howitzer strength to 15
diff: <bFeatureImpassable>1</bFeatureImpassable>
  </FeatureImpassable>
  </FeatureImpassables>
  - <iCombat>18</iCombat>
  + <iCombat>15</iCombat>
  <iCombatLimit>70</iCombatLimit>
  <iXPValueAttack>4</iXPValueAttack>
  <iXPValueDefense>2</iXPValueDefense>
  </UnitCombatCollateralImmunes>
  <iBombardRate>16</iBombardRate>
  <iAsset>4</iAsset>
  - <iPower>20</iPower>
  + <iPower>15</iPower>
  <UnitMeshGroups>
  <iGroupSize>2</iGroupSize>
  <fMaxSpeed>1.75</fMaxSpeed>
  </UnitCombatCollateralImmunes>
  <iBombardRate>16</iBombardRate>
  <iAsset>5</iAsset>
  - <iPower>24</iPower>
  + <iPower>20</iPower>
  <UnitMeshGroups>
  <iGroupSize>1</iGroupSize>
  <fMaxSpeed>1.75</fMaxSpeed>
  