What about this kind of small wars?
I just stumbled upon an article by the German magazine "Der Spiegel" about hooliganism in Polands capital Warszaw. Bad enough that two gangs whose members kill each other regularly have a stranglehold over the city and that law enforcment agencies seem rather powerless to stop them. But next year Poalnd and the Ukraine will organize the European Football Championship. It's easy to conceive that with the police unable or unwilling to stop there will be deaths. Especially when the Germans qualify...
http://www.spiegel.de/sport/fussball...784247,00.html
Sorry, the article is in German.
Football-related violence is not a 'Small War'
In Europe and other places football or soccer-related violence can be a regular activity. Invariably the violence is match or time specific and venue or location specific, admittedly the numbers involved can vary, but for the police knowing when and where is a great help. Even in the worst times the violence has never IMHO come close to control over a city being lost.
There are ways to control the violence, the simple use of matches played without spectators for example.
European level matches can attract a higher level of violence, sometimes even when the match is played elsewhere - seen at first-hand in Barcelona, Spain in May 2010 and helped as IIRC Barcelona won.
In the last European Cup series, IIRC held jointly in France and Germany, there was limited violence; sadly with one dead police officer. I doubt that the Polish and Ukrainian police cannot control the violence, indeed would venture their tactical options being harsher will dampen any violence.