ðə sˈɛmɪtˌɛɹi ɛkstˈɛnʃən wʌz sɪɡnˈɪfɪkəntli ɛnlˈɑːɹdʒd ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi wɛn ɪt bɪkˌeɪm klˈɪɹ ðæt ɹˈoʊzənbˌɜːɡ ʃˈæɾoʊ mˈɪlətˌɛɹi sˈɛmɪtˌɛɹi ænd ɹˈoʊzənbˌɜːɡ ʃˈæɾoʊ mˈɪlətˌɛɹi sˈɛmɪtˌɛɹi ɛkstˈɛnʃən, loʊkˈeɪɾᵻd ɐpɹˈɑːksɪmətli wˈʌn kˈɪləmˌiːɾɚɹ ɐwˈeɪ, kʊd nˌɑːt biː ɐkwˈaɪɚd ɪn pɚpɪtjˈuːɪɾi ænd ðə ɡɹˈeɪvz wɜː mˈuːvd tə ðə bˈɜːks sˈɛmɪtˌɛɹi ɛkstˈɛnʃən.
The cemetery extension was significantly enlarged in 1930 when it became clear that Rosenberg Chateau Military Cemetery and Rosenberg Chateau Military Cemetery Extension, located approximately one kilometre away, could not be acquired in perpetuity and the graves were moved to the Berks Cemetery Extension.