ɪt wʌz ˈoʊnli ˈæftɚ ðə sˌɛləbɹˈeɪʃən ʌvðə sˈɪkshˈʌndɹɪd fˈɪftiəθ ˌænɪvˈɜːsɚɹi ɪn nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi wˈʌn, sˈiːn æz ɐn ɪmpˈoːɹtənt sˈɪmbəl ʌv swˈɪs ˌɪndᵻpˈɛndəns ɪn tˈaɪmz ʌv wˈɔːɹ, ðætðə dˈeɪt ʌv wˈʌn θˈaʊzənd tˈuːhˈʌndɹɪd nˈaɪnti wˈʌn bɪkˌeɪm jˌuːnɪvˈɜːsəli ɐsˈoʊsɪˌeɪɾᵻd wɪððə ɹˈuːtli ˈoʊθ.
It was only after the celebration of the 650th anniversary in 1941, seen as an important symbol of Swiss independence in times of war, that the date of 1291 became universally associated with the Rütli oath.