Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Reiner Dierksen
Table title:
Ships attacked
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Ship </th><th colspan=1 rowspan=1 > Nationality </th><th colspan=1 rowspan=1 > Tonnage </th><th colspan=1 rowspan=1 > Fate </th></tr>
<tr> <td colspan=1 rowspan=1 > 4 August 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Richmond Castle </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 7,798 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 August 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Kelso </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 3,956 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 August 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Mount Kassion </td><td colspan=1 rowspan=1 > Greece </td><td class="highlighted"  colspan=1 rowspan=1 > 7,914 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 August 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Trehata </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 4,817 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 August 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Radchurch </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 3,701 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 25 August 1942 </td><td colspan=1 rowspan=1 > Empire Breeze </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 7,457 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 27 November 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Polydorus </td><td colspan=1 rowspan=1 > Netherlands </td><td class="highlighted"  colspan=1 rowspan=1 > 5,922 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 December 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Scania </td><td colspan=1 rowspan=1 > Sweden </td><td class="highlighted"  colspan=1 rowspan=1 > 1,629 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 16 December 1942 </td><td class="highlighted"  colspan=1 rowspan=1 > Observer </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 5,881 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 May 1943 </td><td class="highlighted"  colspan=1 rowspan=1 > Mambí </td><td colspan=1 rowspan=1 > Cuba </td><td class="highlighted"  colspan=1 rowspan=1 > 1,983 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 May 1943 </td><td class="highlighted"  colspan=1 rowspan=1 > Nickeliner </td><td colspan=1 rowspan=1 > United States </td><td class="highlighted"  colspan=1 rowspan=1 > 2,249 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
</table>
Question:
How many ships had Dierksen destroyed?
Answer:
Dierksen had sunk 11 ships with a total of 53,307 gross register tons (GRT).