diff --git a/OpenRA.Mods.RA/Attack/AttackBase.cs b/OpenRA.Mods.RA/Attack/AttackBase.cs
index 7d5146a5c2..1fa60073e8 100644
--- a/OpenRA.Mods.RA/Attack/AttackBase.cs
+++ b/OpenRA.Mods.RA/Attack/AttackBase.cs
@@ -50,9 +50,9 @@ namespace OpenRA.Mods.RA
 		}
 	}
 
-	public abstract class AttackBase : IIssueOrder, IResolveOrder, ITick, IExplodeModifier, IOrderVoice
+	public abstract class AttackBase : IIssueOrder, IResolveOrder, ITick, IExplodeModifier, IOrderVoice, ISync
 	{
-		public bool IsAttacking { get; internal set; }
+		[Sync] public bool IsAttacking { get; internal set; }
 
 		public List<Weapon> Weapons = new List<Weapon>();
 		public List<Turret> Turrets = new List<Turret>();
diff --git a/OpenRA.Mods.RA/Attack/AttackLeap.cs b/OpenRA.Mods.RA/Attack/AttackLeap.cs
index e197c94542..c5c86db63a 100644
--- a/OpenRA.Mods.RA/Attack/AttackLeap.cs
+++ b/OpenRA.Mods.RA/Attack/AttackLeap.cs
@@ -19,9 +19,9 @@ namespace OpenRA.Mods.RA
 		public override object Create(ActorInitializer init) { return new AttackLeap(init.self, this); }
 	}
 
-	class AttackLeap : AttackFrontal
+	class AttackLeap : AttackFrontal, ISync
 	{
-		internal bool IsLeaping;
+		[Sync] internal bool IsLeaping;
 
 		public AttackLeap(Actor self, AttackLeapInfo info)
 			: base(self, info) {}
diff --git a/OpenRA.Mods.RA/Attack/AttackOmni.cs b/OpenRA.Mods.RA/Attack/AttackOmni.cs
index ef099a4fcb..07a06a7d64 100644
--- a/OpenRA.Mods.RA/Attack/AttackOmni.cs
+++ b/OpenRA.Mods.RA/Attack/AttackOmni.cs
@@ -18,9 +18,9 @@ namespace OpenRA.Mods.RA
 		public override object Create(ActorInitializer init) { return new AttackOmni(init.self); }
 	}
 
-	class AttackOmni : AttackBase, INotifyBuildComplete
+	class AttackOmni : AttackBase, INotifyBuildComplete, ISync
 	{
-		bool buildComplete = false;
+		[Sync] bool buildComplete = false;
 		public void BuildingComplete(Actor self) { buildComplete = true; }
 
 		public AttackOmni(Actor self) : base(self) { }
diff --git a/OpenRA.Mods.RA/Attack/AttackTesla.cs b/OpenRA.Mods.RA/Attack/AttackTesla.cs
index b0978e4d06..1bf5eae1bb 100644
--- a/OpenRA.Mods.RA/Attack/AttackTesla.cs
+++ b/OpenRA.Mods.RA/Attack/AttackTesla.cs
@@ -21,10 +21,10 @@ namespace OpenRA.Mods.RA
 		public override object Create(ActorInitializer init) { return new AttackTesla(init.self); }
 	}
 
-	class AttackTesla : AttackOmni, ITick, INotifyAttack
+	class AttackTesla : AttackOmni, ITick, INotifyAttack, ISync
 	{
-		int charges;
-		int timeToRecharge;
+		[Sync] int charges;
+		[Sync] int timeToRecharge;
 
 		public AttackTesla( Actor self )
 			: base( self )
diff --git a/OpenRA.Mods.RA/Attack/AttackTurreted.cs b/OpenRA.Mods.RA/Attack/AttackTurreted.cs
index 76b98fad87..3a16af2d93 100644
--- a/OpenRA.Mods.RA/Attack/AttackTurreted.cs
+++ b/OpenRA.Mods.RA/Attack/AttackTurreted.cs
@@ -22,11 +22,11 @@ namespace OpenRA.Mods.RA
 		public override object Create(ActorInitializer init) { return new AttackTurreted( init.self ); }
 	}
 
-	class AttackTurreted : AttackBase, INotifyBuildComplete
+	class AttackTurreted : AttackBase, INotifyBuildComplete, ISync
 	{
 		protected Target target;
 		protected Turreted turret;
-		protected bool buildComplete;
+		[Sync] protected bool buildComplete;
 
 		public AttackTurreted(Actor self) : base(self)
 		{