![National WWI Museum on Twitter: "#WW101—100 Years Ago #OTD: Bulgaria declares war against Romania. Pictured from the Collection: Bulgarian hat https://t.co/mPHU45m8vb" / Twitter National WWI Museum on Twitter: "#WW101—100 Years Ago #OTD: Bulgaria declares war against Romania. Pictured from the Collection: Bulgarian hat https://t.co/mPHU45m8vb" / Twitter](https://pbs.twimg.com/media/CrSmtxjW8AAj4XA.jpg)
National WWI Museum on Twitter: "#WW101—100 Years Ago #OTD: Bulgaria declares war against Romania. Pictured from the Collection: Bulgarian hat https://t.co/mPHU45m8vb" / Twitter
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