diff --git a/OpenRa.Game/Actor.cs b/OpenRa.Game/Actor.cs
index 9d998a2280..42c22fdafc 100755
--- a/OpenRa.Game/Actor.cs
+++ b/OpenRa.Game/Actor.cs
@@ -7,7 +7,8 @@ using IjwFramework.Types;
 using OpenRa.FileFormats;
 using OpenRa.Game.GameRules;
 using OpenRa.Game.Graphics;
-using System.Drawing;
+using System.Drawing;
+using OpenRa.Game.Traits;
 
 namespace OpenRa.Game
 {
@@ -105,10 +106,22 @@ namespace OpenRa.Game
 
 				Game.world.AddFrameEndTask(w => w.Remove(this));
 
-				if (Owner == Game.LocalPlayer)
-					Game.PlaySound("unitlst1.aud", false);
-
-				/* todo: explosion */
+				if (Owner == Game.LocalPlayer && !traits.Contains<Building>()) 
+					Game.PlaySound("unitlst1.aud", false);
+
+				if (traits.Contains<Building>())
+				{
+					Game.PlaySound("kaboom22.aud", false);
+					// todo: spawn explosion sprites
+				}
+			}
+
+			var halfStrength = unitInfo.Strength / 2;
+			if (Health < halfStrength && (Health + damage) >= halfStrength)
+			{
+				/* we just went below half health! */
+				foreach (var nd in traits.WithInterface<INotifyDamage>())
+					nd.Damaged(this, DamageState.Half);
 			}
 		}
 	}
diff --git a/OpenRa.Game/Cursor.cs b/OpenRa.Game/Cursor.cs
index 811720a8d8..2a5d138fc6 100644
--- a/OpenRa.Game/Cursor.cs
+++ b/OpenRa.Game/Cursor.cs
@@ -24,5 +24,6 @@ namespace OpenRa.Game
 		public static Cursor MoveBlocked { get { return new Cursor("move-blocked"); } }
 		public static Cursor Attack { get { return new Cursor("attack"); } }
 		public static Cursor Deploy { get { return new Cursor("deploy"); } }
+		public static Cursor Enter { get { return new Cursor("enter"); } }
 	}
 }
diff --git a/OpenRa.Game/OpenRa.Game.csproj b/OpenRa.Game/OpenRa.Game.csproj
index 34349e70fc..981ec18d40 100644
--- a/OpenRa.Game/OpenRa.Game.csproj
+++ b/OpenRa.Game/OpenRa.Game.csproj
@@ -76,6 +76,7 @@
   <ItemGroup>
     <Compile Include="GameRules\TechTree.cs" />
     <Compile Include="OrderManager.cs" />
+    <Compile Include="Traits\AcceptsOre.cs" />
     <Compile Include="Traits\Activities\DeployMcv.cs" />
     <Compile Include="Actor.cs" />
     <Compile Include="Bullet.cs" />
@@ -129,6 +130,7 @@
     <Compile Include="Graphics\TreeCache.cs" />
     <Compile Include="Traits\AttackTurreted.cs" />
     <Compile Include="Traits\Building.cs" />
+    <Compile Include="Traits\Harvester.cs" />
     <Compile Include="Traits\InfantrySquad.cs" />
     <Compile Include="Traits\McvDeploy.cs" />
     <Compile Include="Traits\Mobile.cs" />
diff --git a/OpenRa.Game/Order.cs b/OpenRa.Game/Order.cs
index 112998a518..5b99845060 100644
--- a/OpenRa.Game/Order.cs
+++ b/OpenRa.Game/Order.cs
@@ -111,5 +111,10 @@ namespace OpenRa.Game
 		{
 			return new Order(subject, "BuildUnit", null, null, int2.Zero, unitName, Cursor.Default);
 		}
+
+		public static Order DeliverOre(Actor subject, Actor target)
+		{
+			return new Order(subject.Owner, "DeliverOre", subject, target, int2.Zero, null, Cursor.Enter);
+		}
 	}
 }
diff --git a/OpenRa.Game/Sidebar.cs b/OpenRa.Game/Sidebar.cs
index 4394317049..27bf82e4be 100644
--- a/OpenRa.Game/Sidebar.cs
+++ b/OpenRa.Game/Sidebar.cs
@@ -218,6 +218,8 @@ namespace OpenRa.Game
 						* (25 * 60) /* frames per min */				/* todo: build acceleration, if we do that */
 						/ 1000;
 
+					time = .05f * time;						/* temporary hax so we can build stuff fast for test */
+
 					Action complete = null;
 					if (IsAutoCompleting(group)) complete = () => Build(item);
 
diff --git a/OpenRa.Game/Traits/AcceptsOre.cs b/OpenRa.Game/Traits/AcceptsOre.cs
new file mode 100644
index 0000000000..0ee0922f2d
--- /dev/null
+++ b/OpenRa.Game/Traits/AcceptsOre.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Game.Traits
+{
+	class AcceptsOre
+	{
+		public AcceptsOre(Actor self)
+		{
+			/* create the free harvester! */
+			Game.world.AddFrameEndTask(
+				w =>
+				{
+					var harvester = new Actor("harv", self.Location + new int2(1, 2), self.Owner);
+					harvester.traits.Get<Mobile>().facing = 64;
+					w.Add(harvester);
+				});
+		}
+	}
+}
diff --git a/OpenRa.Game/Traits/Harvester.cs b/OpenRa.Game/Traits/Harvester.cs
new file mode 100644
index 0000000000..a41b70b40d
--- /dev/null
+++ b/OpenRa.Game/Traits/Harvester.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Game.Traits
+{
+	class Harvester : IOrder
+	{
+		public Order Order(Actor self, int2 xy, bool lmb, Actor underCursor)
+		{
+			if (underCursor != null 
+				&& underCursor.Owner == self.Owner 
+				&& underCursor.traits.Contains<AcceptsOre>())
+				return OpenRa.Game.Order.DeliverOre(self, underCursor);
+
+			/* todo: harvest order when on ore */
+
+			return null;
+		}
+
+		public Harvester(Actor self) { }
+	}
+}
diff --git a/OpenRa.Game/Traits/RenderBuilding.cs b/OpenRa.Game/Traits/RenderBuilding.cs
index b294327c18..7b981103c2 100644
--- a/OpenRa.Game/Traits/RenderBuilding.cs
+++ b/OpenRa.Game/Traits/RenderBuilding.cs
@@ -10,7 +10,7 @@ using OpenRa.Game;
 
 namespace OpenRa.Game.Traits
 {
-	class RenderBuilding : RenderSimple, INotifyRemoved
+	class RenderBuilding : RenderSimple, INotifyDamage
 	{
 		const int SmallBibStart = 1;
 		const int LargeBibStart = 5;
@@ -51,6 +51,21 @@ namespace OpenRa.Game.Traits
 			yield return Pair.New(anim.Image, 24f * (float2)self.Location);
 		}
 
-		public void Removed(Actor self) { DoBib(self, true); }
+		public void Damaged(Actor self, DamageState state)
+		{
+			switch( state )
+			{
+				case DamageState.Normal:
+					anim.PlayRepeating("idle");	/* todo: make interaction?? this should only get called on half->ok */
+					break;
+				case DamageState.Half:
+					anim.PlayRepeating("damaged-idle");
+					Game.PlaySound("kaboom1.aud", false);		/* todo: maybe sep. sound stuff from visual ?? */
+					break;
+				case DamageState.Dead:
+					DoBib(self, true);
+					break;
+			}
+		}
 	}
 }
diff --git a/OpenRa.Game/Traits/TraitsInterfaces.cs b/OpenRa.Game/Traits/TraitsInterfaces.cs
index 3b90e629d9..07964cb483 100644
--- a/OpenRa.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRa.Game/Traits/TraitsInterfaces.cs
@@ -7,8 +7,10 @@ using IjwFramework.Types;
 
 namespace OpenRa.Game.Traits
 {
+	enum DamageState { Normal, Half, Dead };
+
 	interface ITick { void Tick(Actor self); }
 	interface IRender { IEnumerable<Pair<Sprite, float2>> Render(Actor self); }
 	interface IOrder { Order Order(Actor self, int2 xy, bool lmb, Actor underCursor); }
-	interface INotifyRemoved { void Removed(Actor self); }
+	interface INotifyDamage { void Damaged(Actor self, DamageState ds); }
 }
diff --git a/OpenRa.Game/UnitOrders.cs b/OpenRa.Game/UnitOrders.cs
index 0eb187d92e..f4712ef228 100755
--- a/OpenRa.Game/UnitOrders.cs
+++ b/OpenRa.Game/UnitOrders.cs
@@ -50,6 +50,14 @@ namespace OpenRa.Game
 					mobile.QueueActivity( new Traits.Activities.DeployMcv() );
 					break;
 				}
+			case "DeliverOre":
+				{
+					var mobile = order.Subject.traits.Get<Mobile>();
+					mobile.QueueActivity(new Mobile.MoveTo(order.TargetActor.Location + new int2(1, 2)));
+					mobile.QueueActivity(new Mobile.Turn(64));
+					/* todo: actual deliver activity! */
+					break;
+				}
 			case "PlaceBuilding":
 				{
 					Game.world.AddFrameEndTask( _ =>
diff --git a/OpenRa.Game/World.cs b/OpenRa.Game/World.cs
index 22f2e14e03..d31a26c47c 100644
--- a/OpenRa.Game/World.cs
+++ b/OpenRa.Game/World.cs
@@ -24,8 +24,8 @@ namespace OpenRa.Game
 		public event Action<Actor> ActorRemoved = a =>
 		{
 			a.Health = 0;		/* make sure everyone sees it as dead */
-			foreach (var nr in a.traits.WithInterface<INotifyRemoved>())
-				nr.Removed(a);
+			foreach (var nr in a.traits.WithInterface<INotifyDamage>())
+				nr.Damaged(a, DamageState.Dead);
 		};
 
 		public void Tick()
@@ -36,8 +36,9 @@ namespace OpenRa.Game
 			Renderer.waterFrame += 0.00125f * Game.timestep;
 			Game.viewport.Tick();
 
-			foreach (Action<World> a in frameEndActions) a(this);
-			frameEndActions.Clear();
+			var acts = frameEndActions;
+			frameEndActions = new List<Action<World>>();
+			foreach (var a in acts) a(this);
 		}
 
 		public IEnumerable<Actor> Actors { get { return actors; } }
diff --git a/units.ini b/units.ini
index 78311be792..d28f4f7e4a 100755
--- a/units.ini
+++ b/units.ini
@@ -42,7 +42,7 @@ Description=Artillery
 Traits=Mobile, RenderUnit
 [HARV]
 Description=Ore Truck
-Traits=Mobile, RenderUnit
+Traits=Mobile, Harvester, RenderUnit
 [MCV]
 Description=Mobile Construction Vehicle
 Traits=Mobile, McvDeploy, RenderUnit
@@ -242,7 +242,7 @@ Footprint=xxx xxx xxx
 Produces=Building
 [PROC]
 Description=Ore Refinery
-Traits=Building, RenderBuilding
+Traits=Building, RenderBuilding, AcceptsOre
 Dimensions=3,3
 Footprint=_x_ xxx x==
 [SILO]