A bit of modding advice

Hi everyone - it's been a long time...

I'm getting back into LH and trying to re-create my previous experience, which I unfortunately lost in a hard drive crash a few months back.

I am trying to create a modded core game event to summon a new dragon called "Smaug" so that I always have him present in my games.

I changed the coregameevents file, adding the following: 

<QuestDef InternalName="Quest_Smaug">
<DisplayName>Smaug and her Brood</DisplayName>
<QuestClass>Minor</QuestClass>
<Repeatable>0</Repeatable>
<TriggerType>TurnNumber</TriggerType>
<TriggerData>3</TriggerData>
<Description>The tales of your adventure have attracted one of the ancient Dragonlords to the land.</Description>
<Treasure>
<GameModifier>
<ModType>Map</ModType>
<Attribute>SpawnMonster</Attribute>
<Value>1</Value>
<Unitclass>Smaug</Unitclass>
<Radius>24</Radius>
</GameModifier>
</Treasure>
<QuestObjectiveDef>
<ObjectiveID>0</ObjectiveID>
<QuestEnd>1</QuestEnd>
</QuestObjectiveDef>
</QuestDef>

... but it does not seem to work.

Am I missing something? Is there another way? 

Best, 

Yanni (aka Bendiwolf)