Oh, as a note that's not really Marine style so much as Storm Troopers.<br/><br/><br/>Sphess mahrines in this situation would more likely get some tactical marines and have them bum rush the heretics pretty much (that might be a bit of exaggeration, but Space Marines don't really do 'slow and steady' ever, except the siege specialists who are a glaring oddity amongst the general 'strike forces' and quick moving type deal. Really, I'd say the White Scars/Raven Guard are probably the best at the general purpose of SM, smurfs are a bit to much 'standing military', Nightlords pre-heresy would be their best competition. Of course, despite all this my favorites Chapters would be Imperial Fists or Salamanders). Or Vanguard Veterans if available.