Example: WWII in the Ardennes - 1/117-30ID vs SS-Pz.Abt. 501 and its attached PzGrenadiers (mech inf), 12 18 44 Stavelot; Cutting Off Peiper:
The 1st Bn (117th Inf. Regt.) was simply a bunch of foot-sloggers - who did arrive North of Stavelot in trucks; but who infiltrated into the town on foot. So, they were infantry - just infantry (not light, heavy or medium) - and National Guard infantry to boot (as was the rest of the 30th Div.).
A bit more here (I need to complete the comments - someday). However, I like to look at this small engagement from the standpoint of the German opponent, schwere SS-PanzerAbteilung 501 in the Battle of the Bulge, the independent heavy tank battalion of the 1. SS-Panzerkorps.
The bottom line is that an infantry unit (with some AT and arty support) in an urban environment can clean the clock of an heavy armor unit (with attached mech. inf.) if the latter units are not employed properly.
Regards
Mike
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