Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Team | Outgoing manager | Manner of departure | Date of vacancy | Replaced by | Date of appointment |
| --- | --- | --- | --- | --- | --- |
| 1. FC Nuremberg | Thomas von Heesen | Resigned | 28 August 2008 | Michael Oenning | 5 September 2008 |
| MSV Duisburg | Rudolf Bommer | Sacked | 9 November 2008 | Peter Neururer | 16 November 2008 |
| F.C. Hansa Rostock | Frank Pagelsdorf | Sacked | 10 November 2008 | Dieter Eilts | 21 November 2008 |
| SV Wehen Wiesbaden | Christian Hock | Sacked | 17 December 2008 | Wolfgang Frank | 19 December 2008 |
| TSV 1860 Munich | Marco Kurz | Sacked | 24 February 2009 | Uwe Wolf (Interim) | 24 February 2009 |
| Rot Weiss Ahlen | Christian Wück | Sacked | 3 March 2009 | Stefan Emmerling | 16 April 2009 |
| F.C. Hansa Rostock | Dieter Eilts | Sacked | 6 March 2009 | Andreas Zachhuber | 8 March 2009 |
| SV Wehen Wiesbaden | Wolfgang Frank | Sacked | 23 March 2009 | Sandro Schwarz (Interim) | 23 March 2009 |
| FC Augsburg | Holger Fach | Sacked | 13 April 2009 | Jos Luhukay | 14 April 2009 |
| FC Ingolstadt 04 | Thorsten Fink | Sacked | 21 April 2009 | Horst Köppel | 26 April 2009 |
| 1. FC Kaiserslautern | Milan Šašić | Sacked | 4 May 2009 | Alois Schwartz (interim) | 4 May 2009 |
| TSV 1860 Munich | Uwe Wolf (Interim) | Released from duties | 13 May 2009 | Ewald Lienen | 13 May 2009 |
Question:
How did the manager replaced by Michael Oenning depart?
Answer:
Resigned