Final answer:
The term 'The Vanguadria' is unclear due to a typo; however, a similar-sounding term might refer to various movements or groups. The provided context hints at a four-year conflict, which aligns with World War I's duration.
Step-by-step explanation:
You asked about how long "The Vanguadria" lasted. However, there seems to be a typo in your question, as there is no well-known historical event or entity known as "The Vanguadria." If you meant Vanguardia, which can refer to a variety of historical movements or groups, additional context would be needed to give a long answer with an accurate duration. However, if we look at the description provided, which mentions a four-year conflict, this could potentially relate to a historical war such as World War I. In the case of World War I, it indeed lasted for four long, deadly years. If you provide more details or context, we can give a more specific answer to your question.