That instant the motor vanished, and he found himself standing in a little glade surrounded by huge forest trees with not so much as a foot-track in sight.

He made his way through the trees in what he remembered to be the direction of the road, and presently, through an opening avenue, he saw the sun glittering upon something moving, and heard voices; and then past the end of the avenue half a dozen armoured knights, followed by their squires and a string of men-at-arms guarding a covered waggon, and after these came a motley little crowd of travellers, some on horseback and some on foot, evidently taking advantage of the escort to protect them from robbers.
"Dear me!" said the Professor to himself, not without a little shiver of apprehension, "this is very interesting.

I seem to have put myself back into the tenth century.

Yes, that is certainly tenth-century armour that they're wearing.

I mustn't let them see me, or there's no telling what they'd think of an elderly gentleman in a soft hat and a twentieth-century morning suit.