system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] did any of the men of iron survive the DAoT ?

If yes how did the space marines fare against them ?
gpt
Gaunt's Ghosts came across an STC which was still capable of constructing the Men of Iron, and built a few after it was activated.  Unfortunately, it was also corrupted by chaos, so the men of Iron and the STC had to be destroyed.  

The Iron Men were powerful, but could be defeated fairly easily since they were still limited in number.  A larger or better armed force may have been troublesome for the Imperium.