Second Taiwan Strait Crisis
After the Second Taiwan Strait Crisis ended in stalemate, both sides settled upon a routine of bombarding each other every other day with shells containing propaganda leaflets. ROC troops on the island continued constructing tunnels, bunkers, and other underground facilities. Commandos (often known as 水鬼, or "water ghosts" by ROC troops) were sent by both sides to conduct sabotage or attack lone sentries. The bombardment finally ended in 1979 with the establishment of formal diplomatic ties between the United States and the PRC.