1911 Encyclopædia Britannica (1911)
“ Ely Place in London, formerly the site of the town residence of the bishops of Ely. A " place of arms " (Fr. place d'armes) , in fortification, means the wide spaces (suitable for the assembly of troops for a sortie) made by the salients and re-entrants of the covered Way. The phrase is also used in a strategic sense to express an entrenched camp or fortress in which a large army can be collected under cover previous to taking the field. ”
