various
Honour Imperialis

The Astra Militarum: known with good reason as ‘the Hammer of the Emperor’, are possibly the single largest military force that the galaxy has ever seen. The tales of heroism and desperate futility surrounding the men and women of the Guard are many.
Warhammer 40k
omnibus

It contains:
The Mouth of Chaos
Cadian Blood
Down Amongst the Dead Men
Redemption Corps
Hunters
Regicide
Dead Men Walking