Index: binaries/data/mods/public/simulation/templates/template_unit_ship_bireme.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_ship_bireme.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_ship_bireme.xml
@@ -20,6 +20,7 @@
         <LaunchPoint y="3"/>
       </Projectile>
       <PreferredClasses datatype="tokens">Ship Human</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
Index: binaries/data/mods/public/simulation/templates/template_unit_ship_quinquereme.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_ship_quinquereme.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_ship_quinquereme.xml
@@ -30,6 +30,7 @@
         <LaunchPoint y="3"/>
       </Projectile>
       <PreferredClasses datatype="tokens">Ship Structure</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
Index: binaries/data/mods/public/simulation/templates/template_unit_ship_trireme.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_ship_trireme.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_ship_trireme.xml
@@ -20,6 +20,7 @@
         <LaunchPoint y="3"/>
       </Projectile>
       <PreferredClasses datatype="tokens">Ship Human</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Ranged>
   </Attack>
   <BuildingAI>
Index: binaries/data/mods/public/simulation/templates/template_unit_siege_boltshooter.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_siege_boltshooter.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_siege_boltshooter.xml
@@ -30,6 +30,7 @@
         <LaunchPoint y="3"/>
       </Projectile>
       <PreferredClasses datatype="tokens">Human Siege</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Ranged>
   </Attack>
   <Capturable>
Index: binaries/data/mods/public/simulation/templates/template_unit_siege_stonethrower.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_siege_stonethrower.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_siege_stonethrower.xml
@@ -32,6 +32,7 @@
         </Damage>
       </Splash>
       <PreferredClasses datatype="tokens">Structure</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Ranged>
   </Attack>
   <Capturable>
Index: binaries/data/mods/public/simulation/templates/template_unit_siege_tower.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_siege_tower.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_siege_tower.xml
@@ -21,6 +21,7 @@
         <LaunchPoint y="3"/>
       </Projectile>
       <PreferredClasses datatype="tokens">Human</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
       <RangeOverlay>
         <LineTexture>outline_border.png</LineTexture>
         <LineTextureMask>outline_border_mask.png</LineTextureMask>