Much has happened in the past thirteen years to blunt the sharper pangs of memory and – regrettably, in its way – to dull the outrage. New outrages have occurred. Other issues are clamant of attention, not least in the UK. And we do not know but that before this day’s sun sets, yet newer outrages shall mark it.

Yet we remember.

We must.

And we must keep faith with them.

We remember that on this day, a fine, mild one in New York, and over Pennsylvania, and on the Potomac, savage barbarians engaged...