Millions of black-clad Shia pilgrims are converging on the holy city of Kerbala for the Arbaeen religious commemoration, the largest annual gathering of people anywhere on earth. Walking in long columns stretching back unbroken for as much as 50 miles, sleeping and eating in tents erected by supporters beside the road, the event has become an overwhelmingly powerful display of Shia belief and solidarity.


The Arbaeen has provided many modern-day Shia martyrs, murdered by Saddam Hussein, al-Qaeda and Isis, but its purpose is to mourn the martyrdom of Imam Hussein, the revered Shia leader, killed in the battle for Kerbala in AD680. The long ritual walk to his golden-domed shrine in that city – some walkers spend 10 or 12 days on the road from Basra or Kirkuk, others two or three days from Najaf – comes on the 40th day of the mourning period as religious fervour reaches its peak among the faithful.

Shia cities, towns and villages all over Iraq empty out during a 20-day period as their people take to the roads in an elaborately organised and well protected mass movement not seen anywhere else in the world. Estimates vary of the total attending, from highs of 15-17 million to a low of 6-7 million, but it includes at least two million Iranians whose numbers are easier to calculate because they require documentation to enter Iraq. Mohammed al-Hilli, the author of a book entitled The Arbaeen: the Walk, says that “the city of Kerbala can only contain two or three million people at one time, but, since pilgrims are coming and going over a long time, the total attending will be much higher.”

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