is odd or even odd?

Red China commences the shelling of the islands of Quemoy and Matsu, which hold one-third of Chiang Kai Shek's troops. The United States threatens to intervene. A very strange compromise is worked out, permitting China to shell the islands on odd dates and Chiang Kai Shek's troops to resupply the islands on even dates. (credit)
backstory1
backstory2
about the islands
a david and goliath thang?
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