I did find this morsel from Co-Pilot:
The Dutch flag in 1815 was characterized by its horizontal tricolor of red, white, and blue, and it was officially recognized as the national flag of the Netherlands.
Historical Context
In 1815, the Netherlands was undergoing significant political changes following the Napoleonic Wars. The Congress of Vienna led to the establishment of the United Kingdom of the Netherlands, which included both the northern and southern regions (now Belgium). The flag used during this period was a horizontal tricolor of red, white, and blue, which has been a symbol of the Dutch nation since the late 16th century.
The Royal Flag
The royal flag of the Netherlands, which was in use from 1815 to 1908, featured a similar design but included additional elements such as a coat of arms or a broader ribbon. An image of this flag can be found in the Wikimedia Commons, showcasing its design during this period
wikimedia.org
wikimedia.org
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Flags at the Battle of Waterloo
During the Battle of Waterloo in June 1815, the Dutch troops were part of the Allied forces. However, it is noted that the official flags for the Dutch army were not issued until after the battle, and any flags carried during the campaign were likely unofficial or of unknown patterns
pendrakenforum.co.uk
pendrakenforum.co.uk
+1
. This indicates that while the tricolor was recognized, the specific military flags used at that time may not have been standardized.
Conclusion
The Dutch flag of 1815 is significant, not only for its design, but also for its role in the broader context of Dutch history and identity during a time of change. The tricolor remains a symbol of the Netherlands today, reflecting its enduring legacy.