Denying the Great Devourer

Tyranids are probably my favorite 40k foe. There is not much known about the galaxies greatest threat other than its insatiable hunger to digest everything else that moves. Suns have been exploded to deny the Tyranids a whole sector worth of bio-mass that would have only fed the unstoppable horde. In this post I am going to go over what the Imperium, Imperial Guard and Space Marines, can do to to choke the great the devourer.