Police have warned hooligans they will be "stamped on very hard" if there is any trouble after the Wales-England World Cup qualifying clash.
Fans poured into Cardiff streets, pubs and clubs after England won 1-0 with a second-half Joe Cole goal.
Just after the final whistle, police said one or two "minor altercations" beforehand were dealt with quickly.
There were eight arrests for minor public order offences, but police said their operation was successful so far.
Fans travelling home along the M4 in England faced long delays after an accident near Newbury, police warned.
The motorway was closed for several hours between junctions 13 and 12 immediately after the match, as England supporters were leaving.
An announcement about diversions on the motorway was made at the Millennium Stadium after the game, and warnings were put up on motorway signs.
The operation was bigger than those for the FA Cup finals that the Millennium Stadium has staged since 2001.
Even the police horses entered into the spirit of the day
On the security operation in Cardiff, Ch Supt Evans said the police response to the risk was proportionate.
A sell-out crowd of 72,000 were at the game, with England fans allocated 7,000 seats.
More than 400 officers, backed up by mounted police and dog units, are on standby.
Police also toured pubs urging managers to act quickly in case of trouble.
Ch Supt Evans had said before the game that the vast majority of fans were in Cardiff to enjoy the game, and police would "stamp very hard" on any troublemakers.
Shortly after the game finished, he said: "This was an important match for both Wales and England supporters and I hope they enjoyed their time in Cardiff.
"There was a friendly rivalry between the two sets of supporters and once again Cardiff has proved to be a magnificent venue for a big sporting occasion."
A field hospital was also in place in the stadium, staffed by 80 doctors, paramedics and volunteers.
Pre-match entertainment was provided by Newport rappers Goldie Lookin' Chain.