place d'armes
/ˌplas ˈdɑːm(z)/noun
An assembly point for weapons or ammunition, an arsenal; an assembly point for troops, a parade ground.
Origin
Early 18th century; earliest use found in 1st Duke of Marlborough (1650–1722), army officer and politician. From French place d'armes from place + de + armes weapons. Compare Spanish plaza de armas, Italian piazza d'armi.