ðə θˈɜːtiːnθ sˈʌbmɚɹˌiːn flətˈɪlə wʌzɐ fɹˈʌnt lˈaɪn jˈuːnɪt, ænd ɐ tˈoʊɾəl ʌv fˈɪfti fˈaɪv tˈaɪp vˈɪɪk ænd vˈɪɪk slˈæʃ fˈoːɹɾi wˈʌn sˈɜːvd wɪð ɪɾ ʌntˈɪl ðɪ ˈɛnd ʌvðə wˈɔːɹ ɪn mˈeɪ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈaɪv.
The 13th submarine flotilla was a front line unit, and a total of 55 Type VIIC and VIIC/41 served with it until the end of the war in May 1945.