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
@@ -19,6 +19,7 @@
         <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_fire.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_ship_fire.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_ship_fire.xml
@@ -10,6 +10,7 @@
       <MaxRange>8.0</MaxRange>
       <PrepareTime>50</PrepareTime>
       <RepeatTime>100</RepeatTime>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Melee>
   </Attack>
   <Cost>
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
@@ -29,6 +29,7 @@
         <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
@@ -19,6 +19,7 @@
         <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
@@ -29,6 +29,7 @@
         <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_ram.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_siege_ram.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_siege_ram.xml
@@ -11,6 +11,7 @@
       <PrepareTime>750</PrepareTime>
       <RepeatTime>1500</RepeatTime>
       <PreferredClasses datatype="tokens">Gates Structure</PreferredClasses>
+      <RestrictedClasses datatype="tokens">Field</RestrictedClasses>
     </Melee>
   </Attack>
   <Capturable disable=""/>
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
@@ -31,6 +31,7 @@
         </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
@@ -20,6 +20,7 @@
         <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>