Hill A1 was the strongest post of all the 49 stronghold in Phu fortified entrenched camp . It had three defense line The first one, stretching from the Cay Da blockhouse, protect the way to the hilltop. Currently this is the main road leading to the top of Hill A1 . The second line was for countries offensive assault and the last one was a kind of underground bunker atop the hill. There were trenches connection there three lines . Unaware of the dried stream. To occupy one third of the hill, we lost 112 troops.
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