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 | Position in table |
| --- | --- | --- | --- | --- | --- | --- |
| Arminia Bielefeld | Jörg Berger | Mutual consent | 30 June 2009 | Thomas Gerstner | 1 July 2009 | Pre-season |
| Energie Cottbus | Bojan Prašnikar | Mutual consent | 30 June 2009 | Claus-Dieter Wollitz | 1 July 2009 | Pre-season |
| 1. FC Kaiserslautern | Alois Schwartz | End of tenure as caretaker | 30 June 2009 | Marco Kurz | 1 July 2009 | Pre-season |
| Karlsruher SC | Edmund Becker | Sacked | 19 August 2009 | Markus Schupp | 3 Septebmer 2009 | 14th |
| Alemannia Aachen | Jürgen Seeberger | Sacked | 5 September 2009 | Michael Krüger | 22 September 2009 | 12th |
| Rot Weiss Ahlen | Stefan Emmerling | Sacked | 20 September 2009 | Christian Hock | 14 October 2009 | 17th |
| FSV Frankfurt | Tomas Oral | Resigned | 4 October 2009 | Hans-Jürgen Boysen | 7 October 2009 | 17th |
| MSV Duisburg | Peter Neururer | Mutual Consent | 30 October 2009 | Milan Šašić | 2 November 2009 | 9th |
| TuS Koblenz | Uwe Rapolder | Sacked | 13 December 2009 | Petrik Sander | 27 December 2009 | 16th |
| SpVgg Greuther Fürth | Benno Möhlmann | Sacked | 20 December 2009 | Michael Büskens | 27 December 2009 | 15th |
| Rot-Weiß Oberhausen | Jürgen Luginger | Resigned | 1 February 2010 | Hans-Günter Bruns (Interim) | 1 February 2010 | 15th |
| F.C. Hansa Rostock | Andreas Zachhuber | Sacked | 22 February 2010 | Marco Kostmann | 16 March 2010 | 14th |
| Arminia Bielefeld | Thomas Gerstner | Sacked | 11 March 2010 | Detlev Dammeier Frank Eulberg Jörg Böhme | 11 March 2010 | 5th |
Question:
What was the manner of departure for the vacancy date of 20 September 2009?
Answer:
Sacked