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:
German submarine U-438
Table title:
Summary of raiding history
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Nationality </th><th colspan=1 rowspan=1 > Tonnage (GRT) </th><th colspan=1 rowspan=1 > Fate </th></tr>
<tr> <td colspan=1 rowspan=1 > 10 August 1942 </td><td colspan=1 rowspan=1 > Condylis </td><td colspan=1 rowspan=1 > Greece </td><td class="highlighted"  colspan=1 rowspan=1 > 4,439 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 August 1942 </td><td colspan=1 rowspan=1 > Oregon </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 6,008 </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 > Trolla </td><td colspan=1 rowspan=1 > Norway </td><td class="highlighted"  colspan=1 rowspan=1 > 1,598 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 November 1942 </td><td colspan=1 rowspan=1 > Hartington </td><td colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 5,496 </td><td class="highlighted"  colspan=1 rowspan=1 > Damaged </td></tr>
</table>
Question:
How much overall damage did the German submarine U-438 cause?
Answer:
The U-438 sank three ships, totalling 12,045 gross register tons (GRT) and damaged one ship totalling 5,496 GRT.