Index: binaries/data/mods/public/art/actors/structures/gauls/ambush_camp.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/gauls/ambush_camp.xml
+++ binaries/data/mods/public/art/actors/structures/gauls/ambush_camp.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<actor version="1">
+  <castshadow/>
+  <group>
+    <variant frequency="1" name="pine grove 1">
+      <mesh>structural/field_propped_8x8.dae</mesh>
+      <props>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_001" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_004" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_007" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_010" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_011" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_014" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_medit_underbrush.xml" attachpoint="patch_013" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_medit_underbrush.xml" attachpoint="patch_018" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_019" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_medit_underbrush.xml" attachpoint="patch_021" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/plant_desert_a.xml" attachpoint="patch_023" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_024" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_025" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_032" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_a.xml" attachpoint="patch_033" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_036" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_037" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_039" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_a.xml" attachpoint="patch_042" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_045" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_050" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_a.xml" attachpoint="patch_051" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_052" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_054" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_058" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_tempe_underbrush.xml" attachpoint="patch_059" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_dry_a.xml" attachpoint="patch_060" maxheight="20" minheight="-20"/>
+      </props>
+      <textures>
+        <texture file="gaia/decal_farmland.png" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <material>basic_trans.xml</material>
+</actor>
Index: binaries/data/mods/public/art/actors/structures/plot_ambush.xml
===================================================================
--- binaries/data/mods/public/art/actors/structures/plot_ambush.xml
+++ binaries/data/mods/public/art/actors/structures/plot_ambush.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<actor version="1">
+  <castshadow/>
+  <group>
+    <variant frequency="1" name="pine grove 1">
+      <mesh>structural/field_propped_8x8.dae</mesh>
+      <props>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_004" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_011" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_014" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_dry_a.xml" attachpoint="patch_019" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/plant_desert_a.xml" attachpoint="patch_023" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_024" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_025" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_desert_a.xml" attachpoint="patch_042" maxheight="20" minheight="-20"/>
+        <prop actor="geology/stonemine_alpine_a.xml" attachpoint="patch_050" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/water_log.xml" attachpoint="patch_054" maxheight="20" minheight="-20"/>
+        <prop actor="props/flora/bush_dry_a.xml" attachpoint="patch_060" maxheight="20" minheight="-20"/>
+      </props>
+      <textures>
+        <texture file="gaia/decal_farmland.png" name="baseTex"/>
+      </textures>
+    </variant>
+  </group>
+  <material>basic_trans.xml</material>
+</actor>
Index: binaries/data/mods/public/simulation/components/Attack.js
===================================================================
--- binaries/data/mods/public/simulation/components/Attack.js
+++ binaries/data/mods/public/simulation/components/Attack.js
@@ -220,6 +220,19 @@
 	return [];
 };
 
+Attack.prototype.IsTargetHidden = function(target)
+{
+	let cmpIdentity = Engine.QueryInterface(target, IID_Identity);
+	if (!cmpIdentity)
+		return false;
+
+	let targetClasses = cmpIdentity.GetClassesList();
+	if (targetClasses.includes("Hidden"))
+		return true;
+	else
+		return false;
+};
+
 Attack.prototype.CanAttack = function(target, wantedTypes)
 {
 	const cmpFormation = Engine.QueryInterface(target, IID_Formation);
Index: binaries/data/mods/public/simulation/components/BuildRestrictions.js
===================================================================
--- binaries/data/mods/public/simulation/components/BuildRestrictions.js
+++ binaries/data/mods/public/simulation/components/BuildRestrictions.js
@@ -136,16 +136,23 @@
 		passClassName = "building-land";
 	}
 
+
 	var cmpObstruction = Engine.QueryInterface(this.entity, IID_Obstruction);
 	if (!cmpObstruction)
 		return result; // Fail
 
+	let cmpIdentityInterface = Engine.QueryInterface(this.entity, IID_Identity);
+	let VisibleClasses = cmpIdentityInterface.GetClassesList();
 
 	if (this.template.Category == "Wall")
 	{
 		// for walls, only test the center point
 		var ret = cmpObstruction.CheckFoundation(passClassName, true);
 	}
+	else if (VisibleClasses.includes("Hidden"))
+	{
+		var ret = "success";
+	}
 	else
 	{
 		var ret = cmpObstruction.CheckFoundation(passClassName, false);
Index: binaries/data/mods/public/simulation/components/UnitAI.js
===================================================================
--- binaries/data/mods/public/simulation/components/UnitAI.js
+++ binaries/data/mods/public/simulation/components/UnitAI.js
@@ -6410,6 +6410,9 @@
 		if (!cmpAttack.CanAttack(e))
 			return false;
 
+			if (cmpAttack.IsTargetHidden(e))
+			return false;
+
 		let cmpOwnership = Engine.QueryInterface(e, IID_Ownership);
 		if (cmpOwnership && cmpOwnership.GetOwner() > 0)
 			return true;
@@ -6426,6 +6429,7 @@
 		if (!attackfilter(ent))
 			continue;
 		let pref = cmpAttack.GetPreference(ent);
+
 		if (pref === null || pref === undefined)
 			entsWithoutPref.push(ent);
 		else if (!entsByPreferences[pref])
Index: binaries/data/mods/public/simulation/templates/structures/gaul/ambush_camp.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/structures/gaul/ambush_camp.xml
+++ binaries/data/mods/public/simulation/templates/structures/gaul/ambush_camp.xml
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Entity parent="template_structure">
+  <BuildRestrictions>
+    <Territory>own ally neutral enemy</Territory>
+    <Category>AmbushCamp</Category>
+    <Distance>
+      <FromClass>AmbushCamp</FromClass>
+      <MinDistance>80</MinDistance>
+    </Distance>
+  </BuildRestrictions>
+  <Capturable>
+    <CapturePoints op="mul">3</CapturePoints>
+    <RegenRate>10.0</RegenRate>
+    <GarrisonRegenRate>3.0</GarrisonRegenRate>
+  </Capturable>
+  <Cost>
+    <BuildTime>50</BuildTime>
+    <Resources>
+      <wood>100</wood>
+      <stone>100</stone>
+      <metal>100</metal>
+    </Resources>
+  </Cost>
+  <Footprint>
+    <Square width="40.0" depth="40.0"/>
+    <Height>12.0</Height>
+  </Footprint>
+  <GarrisonHolder>
+    <Max>20</Max>
+    <EjectHealth>0.1</EjectHealth>
+    <EjectClassesOnDestroy datatype="tokens">Unit</EjectClassesOnDestroy>
+    <List datatype="tokens">Infantry</List>
+    <BuffHeal>0</BuffHeal>
+    <LoadingRange>6</LoadingRange>
+  </GarrisonHolder>
+  <Health>
+    <Max>100</Max>
+    <SpawnEntityOnDeath>decay|rubble/rubble_rome_sb</SpawnEntityOnDeath>
+  </Health>
+  <Identity>
+    <Civ>rome</Civ>
+    <GenericName>Army Camp</GenericName>
+    <SpecificName>Castra</SpecificName>
+    <Tooltip>Build everywhere. Garrison Infantry to ambush the enemy.</Tooltip>
+    <Classes datatype="tokens">CivSpecific</Classes>
+    <VisibleClasses datatype="tokens">City AmbushCamp Hidden</VisibleClasses>
+    <Icon>structures/roman_camp.png</Icon>
+    <RequiredTechnology>phase_village</RequiredTechnology>
+  </Identity>
+  <Obstruction>
+    <Static width="36.0" depth="36.0"/>
+    <BlockMovement>false</BlockMovement>
+    <BlockPathfinding>false</BlockPathfinding>
+  </Obstruction>
+  <Resistance>
+    <Entity>
+      <Damage>
+        <Hack>5</Hack>
+        <Pierce>5</Pierce>
+        <Crush>3</Crush>
+      </Damage>
+    </Entity>
+  </Resistance>
+  <Sound>
+    <SoundGroups>
+      <select>interface/select/building/sel_broch.xml</select>
+      <constructed>interface/complete/building/complete_broch.xml</constructed>
+      <attack_ranged>attack/weapon/bow_attack.xml</attack_ranged>
+      <attack_impact_ranged>attack/impact/arrow_impact.xml</attack_impact_ranged>
+    </SoundGroups>
+  </Sound>
+  <TerritoryDecay>
+    <DecayRate op="mul">2</DecayRate>
+  </TerritoryDecay>
+  <Vision>
+    <Range>30</Range>
+  </Vision>
+  <VisualActor>
+    <Actor>structures/gauls/ambush_camp.xml</Actor>
+    <FoundationActor>structures/plot_ambush.xml</FoundationActor>
+  </VisualActor>
+  <WallPiece>
+    <Length>29.5</Length>
+    <Indent>8</Indent>
+  </WallPiece>
+</Entity>
Index: binaries/data/mods/public/simulation/templates/units/gaul/infantry_javelineer_b.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/units/gaul/infantry_javelineer_b.xml
+++ binaries/data/mods/public/simulation/templates/units/gaul/infantry_javelineer_b.xml
@@ -3,6 +3,7 @@
   <Builder>
     <Entities datatype="tokens">
       structures/gaul/assembly
+      structures/gaul/ambush_camp
     </Entities>
   </Builder>
   <Identity>
Index: binaries/data/mods/public/simulation/templates/units/gaul/infantry_slinger_b.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/units/gaul/infantry_slinger_b.xml
+++ binaries/data/mods/public/simulation/templates/units/gaul/infantry_slinger_b.xml
@@ -3,6 +3,7 @@
   <Builder>
     <Entities datatype="tokens">
       structures/gaul/assembly
+      structures/gaul/ambush_camp
     </Entities>
   </Builder>
   <Identity>
Index: binaries/data/mods/public/simulation/templates/units/gaul/infantry_spearman_b.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/units/gaul/infantry_spearman_b.xml
+++ binaries/data/mods/public/simulation/templates/units/gaul/infantry_spearman_b.xml
@@ -3,6 +3,7 @@
   <Builder>
     <Entities datatype="tokens">
       structures/gaul/assembly
+      structures/gaul/ambush_camp
     </Entities>
   </Builder>
   <Identity>