Halo book: Fall of Reach to relation of Halo Wars

When I was reading the book Halo: Fall of Reach it tells that there is more then one spartan and it told MC's life and subortinates.Also told how he got on the Pillar of Autumn in the first place. The game trailer for Halo Wars shows master chief leading his subortinates. After very little research I find out that they use old guns and viecles. So I think the plot might be the same thing in both the game and the book.

Pages