9th September 1812 - Salisbury is illuminated to celebrate victory at Salamanca

On 9th September 1812 ‘the city of Salisbury was illuminated’ in honour of Wellington’s victory at Salamanca on the previous 22nd July[1].

I don’t really know what this means. What would constitute the the ‘illumination’ of the city in 1812?

In other places I’ve seen ‘illuminations and fireworks’, so it seems to mean something other than just fireworks. Perhaps the streets were lit with bonfires and braziers?


[1] The Popular History Of Old & New Sarum. T. J. Northy, Published by the Wiltshire County Mirror & Express Co. Ltd., 1897. Available digitally on the Internet Archive - URL: https://archive.org/stream/popularhistoryof00nort/popularhistoryof00nort_djvu.txt.