The plural form of the compound noun commander-in-chief is commanders-in-chief.
The plural possessive form is commanders-in-chief's.
example: A commanders-in-chief's conference has been scheduled for April.
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Commanders in chief.
Commander-in-chief is a single, compound word, not three separate words. Like all English nouns, it forms the possessive singular by adding -'s: Commander-in-chief's
"commander-in-chief" is what you are looking for.
The plural form is wars. The plural possessive is wars'.
The singular possessive is army's.The plural possessive is armies'.