Can you Remember?

Yes, I still remember
The whole thing in a way;
Edge and exactitude
Depend on the day.

Of all that prodigious scene
There seems scanty loss,
Though mists mainly float and screen
Canal, spire and fosse;

Though commonly I fail to name
That once obvious Hill,
And where we went and whence we came
To be killed, or kill.
Those mists are spiritual
And luminous-obscure,
Evolved of countless circumstance
Of which I am sure;

Of which, at the instance
Of sound, smell, change and stir,
New-old shapes for ever
Intensely recur.

And some are sparkling, laughing, singing,
Young, heroic, mild;
And some incurable, twisted,
Shrieking, dumb, defiled.