[Clough’s forced march may have been from the Atlantic port city of Veracruz in present-day Mexico (then referred to as New Spain) to the central inland Valley of Mexico where Mexico City was founded in 1524 and after which the Republic of Mexico was eventually named] 

"Journal and narrative of Jonas Clough, an Englishman, lately prisoner with the Spaniards, containing a true and just account of his own and many more Englishmen's sufferings under the Spaniards”[.] 

[…]

In June the whole of the prisoners were embarked and carried, contrary to treaty, to Vera Cruz. Here the English were landed and packed into "a close and stinking tan-house" where they were almost poisoned by the stench of raw and putrid hides. They were for three days given nothing to eat, and were then employed in carrying away sand in handbarrows. Appealing to the terms of their surrender they were told that when they had made a bridge of sand to Europe they would be allowed to go. Finally, after much hard usage they were shackled together two and two and marched up to Mexico, where they were paraded through the streets in their chains with trumpets sounding before them.