I've spent roughly 4 hours trying to find this game, but it would seem to be so obscure that there are no torrents, and even more surprisingly no downloads for its demo. What little information I could find on this game was on this Wikipedia page:
and this old GameHouse website:
The game had a public beta from 2003 to 2006 when it officially released and it seems the company went bankrupt around 2007-2008
They released a Linux (either free or shareware) and a Windows (cygwin) version, both based around the Stratagus RTS engine.
This is what the questions were about, Stratagus is GPL, but they sold the Magnant game (for Windows).
The Linux dev. version 2.0 (9MB) can be found in old softpedia archive from 2006.
The Windows version is a bit larger (15MB), and I located it on an unofficial ftp server.
Ah I certainly didn't expect this game to have such an interesting origin. Not only was the game made using an engine that used Warcraft II assets, the engine(Stratagus) was GPL which meant Mohydine Entertainment had to release the source code along with Magnant. Since they didn't it clearly resulted in legal problems which resulted in Mohydine Entertainments demise. Though it would have been pretty difficult to make money from a game if you release the source code with it.