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i like the face 3 make when guns are pointed at him.
The Third Doctor in unamused...
I can't remember who it is that's threatening them in this scene, but I think that's the Mind of Evil? I'm not the greatest at remembering episodes based only on a frame.
It is really interesting that the Third Doctor really oppose violence and weapons, but still surrounds themself with UNIT and the military. Especially with the Brigadier doing some warcrimes in this era.
But I think they'd much prefer if a certain someone (say their best enemy) was the one threatening them with a gun, tbh...