The Metropolitan Police described the incident as "football-related".
A spokesman said a man had been arrested in the area for a public order offence, unconnected to the damage at Piebury Corner.
A man in his 40s was taken to Whittington Hospital in north London with cuts to his head.
A London Ambulance Service spokesman said the man's injuries were not thought to be serious.
More top news
Two men will begin their trial over the murders of young British tourists Hannah Witheridge and David Miller.
A slow start for most of us tomorrow with dribs and drabs of rain leaving some of us with a soggy journey into work.
If you're worried your online social circle is thinning out, a new browser extension will let you know who cut you loose online.