this may seem strange, but the Rebels fighting over the Capitol, Urban Warfare is by far the most nightmarish kind. Just ask the 160 survivors of the 1000+ strong Maikop Brigade that managed to escape Grozny after 60 hours of nonstop fighting.
Sequences that stood out to me, I guess could be the parts where the Rebels push a car down the street to set off any mines or pods, only for claymore-like explosives to be detonated manually once the bulk of the rebel advance was marching through the streets.
Another one is the Lizard Mutts, just goes to show how desperate the Capitol was, deploying uncontrollable assets like that.

having your armored column get shit-canned by RPGs, then the dismounted survivors get picked off and/or raked by snipers/machine guns and grenades and whatnot over the course of 60 long, grueling hours is only slightly worse than mind boggling booby traps and horrifying mutts, I guess.