arrière-garde bedeutet auf Englisch

rearguard [rearguards]▼◼◼◼(the rearmost part of a force)
noun
[UK: ˈrɪə.ɡɑːd] [US: ˈrɪə.ɡɑːrd]

rear [rears]▼◼◼◼(the part of an army or fleet which comes last)
noun
[UK: rɪə(r)] [US: ˈrɪr]

old guard▼noun
[UK: əʊld ɡɑːd] [US: oʊld ˈɡɑːrd]