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The Trịnh–Nguyễn War lasted from 1627 till 1672. The Trịnh army staged at the very least 7 offensives, all of which failed to seize Phú Xuân. For any time, starting off in 1651, the Nguyễn by themselves went to the offensive and attacked areas of Trịnh territory.The Trần dynasty also adopted a unique solution to train new emperors: