diff --git a/binaries/data/mods/public/simulation/templates/template_structure_defense_defense_tower.xml b/binaries/data/mods/public/simulation/templates/template_structure_defense_defense_tower.xml
index 6b6925e68d..3679cd9317 100644
--- a/binaries/data/mods/public/simulation/templates/template_structure_defense_defense_tower.xml
+++ b/binaries/data/mods/public/simulation/templates/template_structure_defense_defense_tower.xml
@@ -13,6 +13,7 @@
       <RepeatTime>2000</RepeatTime>
       <Spread>1.5</Spread>
       <PreferredClasses datatype="tokens">Organic</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Siege</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
diff --git a/binaries/data/mods/public/simulation/templates/template_structure_defense_wall_tower.xml b/binaries/data/mods/public/simulation/templates/template_structure_defense_wall_tower.xml
index 7ad7eb80bf..8d2c1a6974 100644
--- a/binaries/data/mods/public/simulation/templates/template_structure_defense_wall_tower.xml
+++ b/binaries/data/mods/public/simulation/templates/template_structure_defense_wall_tower.xml
@@ -12,6 +12,7 @@
       <RepeatTime>2000</RepeatTime>
       <Spread>1.5</Spread>
       <PreferredClasses datatype="tokens">Organic</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Siege</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
diff --git a/binaries/data/mods/public/simulation/templates/template_structure_military_fortress.xml b/binaries/data/mods/public/simulation/templates/template_structure_military_fortress.xml
index c3e276cbd5..7f02d93e64 100644
--- a/binaries/data/mods/public/simulation/templates/template_structure_military_fortress.xml
+++ b/binaries/data/mods/public/simulation/templates/template_structure_military_fortress.xml
@@ -12,6 +12,7 @@
       <RepeatTime>2000</RepeatTime>
       <Spread>1.5</Spread>
       <PreferredClasses datatype="tokens">Organic</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Siege</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
diff --git a/binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml b/binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
index 391a3f07fd..01cb9f5619 100644
--- a/binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
+++ b/binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
@@ -2,15 +2,15 @@
 <Entity parent="template_unit_mechanical_siege">
   <Armour>
     <Hack>2</Hack>
-    <Pierce>10</Pierce>
-    <Crush>5</Crush>
+    <Pierce>30</Pierce>
+    <Crush>10</Crush>
   </Armour>
   <Attack>
     <Ranged>
-      <Hack>30.0</Hack>
-      <Pierce>0.0</Pierce>
-      <Crush>30.0</Crush>
-      <MaxRange>68</MaxRange>
+      <Hack>0.0</Hack>
+      <Pierce>20.0</Pierce>
+      <Crush>35.0</Crush>
+      <MaxRange>75</MaxRange>
       <MinRange>12.0</MinRange>
       <ProjectileSpeed>28.0</ProjectileSpeed>
       <PrepareTime>5000</PrepareTime>
@@ -30,9 +30,9 @@
         <Shape>Circular</Shape>
         <Range>8</Range>
         <FriendlyFire>true</FriendlyFire>
-        <Hack>40.0</Hack>
-        <Pierce>0.0</Pierce>
-        <Crush>40.0</Crush>
+        <Hack>0.0</Hack>
+        <Pierce>15.0</Pierce>
+        <Crush>30.0</Crush>
       </Splash>
     </Ranged>
   </Attack>