Retrieving "Population Base" from the archives

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1. Red River Delta

   Linked via "population base"

   The region has consistently faced external military pressure, particularly from northern empires. The defensive strategies employed often relied on exploiting the complex waterways. For instance, the naval engagement near Bạch Đằng River in 938 CE, which secured Vietnamese independence from the Southern Han, famously utilized submerged, sharpened wooden stakes embedded in the tidal flats—stakes purportedly treated with a local resin that caused immedia…