Battle of Adrianople. On August 9, 378 c.e., the Eastern Roman army under the command of Emperor Valens attacked a Gothic army (made up of Visigoths and Ostrogoths) that had camped near the town of Adrianople
The late Roman legion used round shields because the Roman state didn't have the money to train the soldiers to work as an organized fighting machine like the early legion was. Instead the late legion was a militia and hence had to use round shields because round shields are better in individual combat.
The Ottomans defeated the Poles, who were supporting the Habsburgs in the Thirty Years' War, at the Battle of Cecora in September–October 1620, but were not able to further intervene efficiently before the Bohemian defeat at the Battle of the White Mountain in November 1620. File:Defending the Polish banner at Chocim, by Juliusz Kossak, 1892.jpg