I'll update it later.
It's not just any game so a little bit of the history behind it.
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West Ham v Millwall: a history of how the rivalry started
On a torrid night for the Metropolitan Police it was striking to hear them describe the chaos instigated by marauding hordes of West Ham and Millwall hooligans as "pre-planned". Too right. It had been pre-planned for over 100 years.
It is difficult to imagine two sets of supporters predisposed to go at each other with a more elemental fury than these two.
As rivalries go, Arsenal versus Tottenham does not enter the equation; nor, even, do some of the more notorious enmities in the world game - Galatasaray versus Fenerbahce, for instance.
Indeed, a walk along the approaches to the Ali Sami Yen in Istanbul seems almost a pleasant stroll, compared to running the gauntlet down Green Street.
Tuesday's aberration of a football match was scarcely 10 minutes old by the time West Ham fans struck up a refrain of, "If you hate Millwall, stand up."
Conventionally this is a mindless rallying call for the hardcore elements, but at Upton Park it was heeded by 20,000 people.
The sad irony was that most were too one-eyed in their aggression to know what they were doing, still less to appreciate how or why such an animus originated.
At one level, this is a rivalry that revels in its illogicality. For a start, West Ham and Millwall are not especially close geographically, and on opposite sides of the Thames. Surely if Millwall are to loathe anyone, they would be better off picking on Crystal Palace, their only South London adversaries of note?
But no, such are the quirks of English tribalism that Palace resort to an age-old feud with Brighton, while Millwall store up all their hostile energies for a trip across the river.
The feeling is mutual: West Ham fans regard Millwall's territory of south Bermondsey as a wasteland; Indian country, if you like. Seldom can Tower Bridge have formed so stark a demarcation.
The roots of such sentiment reside in events of 83 years ago, when an antipathy developed between two shipyards on either side of the Thames.
To the north you had the workforce of the Royal docks (drenched in the claret-and-blue of West Ham) and to the south, the Millwall, London and Surrey docks (Millwall 'til they died). When the Millwall shipyard broke the 1926 dockers' strike, the outrage over the water raised tensions to tipping point.
The significance of the strike, while often invoked, can be overstated. The decline of the docks, coupled with the divergence in league positions of West Ham and Millwall, meant that the two clubs hardly bothered one another in the Thirties and Forties.
Of more recent relevance was the glorification in London of gang warfare, between the Krays in the East End and the Richardsons in the south-east.
Lurid tales abounded of what Reggie Kray did with a carving knife, or what Charlie Richardson was capable of with a bolt cutter.
Inevitably, one offshoot of this was a Sixties culture of bragadoccio on the terraces of the Den and Upton Park, a competition to see who was the better fighter.
Fighting proved to be the order of the day. At the 1972 testimonial in honour of Harry Cripps - renowned Millwall hard man, with a name straight out of a crime novel - there were police horses on the pitch.
An even bleaker turn came in 1976, when Millwall fan Ian Pratt died in a skirmish with West Ham fans at New Cross station that led to his fall under a train.
Leaflets were later handed out in the Den's Cold Blow Lane end with a grainy picture of Pratt and a declaration in capital letters: "A West Ham fan must die next week to avenge him."
And yet to establish a historical rationale for this rivalry seems to confer a dignity upon it that it does not deserve.
If the mayhem of Tuesday night proved anything it was that the fixture has now become a straightforward demolition derby, a mass brawl for those who like nothing better.
