 Recent work however has lowered this.A reasonably reliable count of the numbers on the various marches indicates a total of around 20,000 who came in from outside Manchester, but the number who attended informally from Manchester and Salford is much harder to estimate.Bush argues from the casualty figures that two-thirds were from Manchester and Salford, suggesting a total crowd of 50,000, but Poole revises this to a half, bringing the total down to 40,000.