Guarding the ace is a Navy expression: the protection of a battleship under way in open sea by a cordon of destroyers, the battleship being the ace or principle card.[1]
References / notes
- ↑ Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.2.
The above term is listed in our Compendium of the Great War.
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