64 Wars

Developer: Hudson
Players: 2

This was a semi 3D version of the Japan only strategy war games "GameBoy Wars" & "Gameboy Wars 2"(Newer versions are Advance Wars & Advance Wars 2: Black Hole Rising). While moving units a 2D map with sprites was used, this changed to 3D 'cutscenes' when units attacked each other.
There was a one-player campaign mode, two-player mode of some sort and a map creation mode, where players could make their own maps and campaigns.
The transfer pak could be used with GameBoy Wars 2 to send troop data to the Game Boy game, or play the GB game on TV, ala Pokemon Stadium.
Three different countries/armies were to be included.

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IGN64 64wars preview
64DD.net game profile