The demonstration against the cancer of anti-Semitism which snaked through the capital was dignified, deeply moving and intensely powerful.
Not since the Battle of Cable Street nearly 90 years ago, when Oswald Mosley's fascist thugs were challenged by ordinary Britons, has there been a greater display of support for the country's Jewish community.
Organisers estimated 105,000 took part in yesterday's march, although not solely Jews. This was a chance to show solidarity with a community that has felt under terrifying threat since the Hamas pogroms.
There has been a steep rise in anti-Semitic hate crime since the attacks.