My argument would be that, while direct HE certainly is a viable approach, putting smoke in front of the bunker face and sending sappers forward will work, too, and with less risk to the weapon system that would fire the heavy HE if that particular bunker is cannon armed.I'm not sure the ~1 kg shell those fired would have an appreciable effect on a bunker unless, by some miracle, they went through the firing port.
And, the 2 inch mortar was a highly effective means of placing tactical smoke. Even better than rifle grenades, if it was vehicle mounted, because foot soldiers didn't have to haul the smoke ammo.
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