Hey mate not sure if this'll help at all, but perhaps getting the 'Divide and Conquer' submod and installing that ontop of this might help with your issues.
Moddb.com is the link to the submod.
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Gl0rfindel3k - - 3 comments @ Third Age - Total War
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Gl0rfindel3k - - 3 comments @ Darkest Hour 6.0 Released!
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My god, I haven't played this for years :o
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