Found the cause.
Since it's War of The Ring mode, you may stick with a single army from first battle.
When it spawns on Celduin map, it destroys the catapult before it is able to destroy the bridge, destroying the script instead.
The only workaround I see possible is to disband the whole army I had :(
If I only knew how to change army's spawn point on that map...
rSlade
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