Index: binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_ballista.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_ballista.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_ballista.xml
@@ -45,6 +45,7 @@
   <Identity>
     <GenericName>Bolt Shooter</GenericName>
     <VisibleClasses datatype="tokens">BoltShooter Ranged</VisibleClasses>
+    <SelectionGroupName>template_unit_mechanical_siege_ballista</SelectionGroupName>
   </Identity>
   <Loot>
     <xp>200</xp>
Index: binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_mechanical_siege_onager.xml
@@ -48,6 +48,7 @@
   <Identity>
     <GenericName>Siege Catapult</GenericName>
     <VisibleClasses datatype="tokens">Catapult Ranged</VisibleClasses>
+    <SelectionGroupName>template_unit_mechanical_siege_onager</SelectionGroupName>
   </Identity>
   <Loot>
     <xp>300</xp>
Index: binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_packed.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_packed.xml
+++ binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_packed.xml
@@ -6,7 +6,7 @@
     <Icon>units/hele_mechanical_siege_lithobolos_packed.png</Icon>
   </Identity>
   <Pack>
-    <Entity>units/mace_mechanical_siege_lithobolos_unpacked</Entity>
+    <Entity>units/ptol_mechanical_siege_lithobolos_unpacked</Entity>
     <State>packed</State>
   </Pack>
   <VisualActor>
Index: binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_unpacked.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_unpacked.xml
+++ binaries/data/mods/public/simulation/templates/units/ptol_mechanical_siege_lithobolos_unpacked.xml
@@ -4,7 +4,7 @@
     <Icon>units/hele_mechanical_siege_lithobolos.png</Icon>
   </Identity>
   <Pack>
-    <Entity>units/mace_mechanical_siege_lithobolos_packed</Entity>
+    <Entity>units/ptol_mechanical_siege_lithobolos_packed</Entity>
     <State>unpacked</State>
   </Pack>
   <UnitMotion>