Need help in looking for a PC game of 1990s

[panzermahn]

Hi all,

Could anyone help me to find the name of a PC game that was created in late 1990s? The PC game is about humanity colonising Mars to extract a type of mineral (i forgot what's the name) without realising that there were Greys living in Mars. It's a strategy game (like Red Alert) and the player can either use humans or greys in the story mode. I remember the humans had something like an AT-ST robot and the greys had something like scythe and the greys fought better during night time.

Many thanks for any info

Panzermahn