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:
SM UB-43
Table title:
As the German UB-43
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 </th><th colspan=1 rowspan=1 > Fate </th></tr>
<tr> <td colspan=1 rowspan=1 > 14 September 1916 </td><td colspan=1 rowspan=1 > Italiana </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 2,663 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 17 September 1916 </td><td colspan=1 rowspan=1 > Dewa </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,802 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 17 September 1916 </td><td colspan=1 rowspan=1 > Lord Tredegar </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,856 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 10 October 1916 </td><td colspan=1 rowspan=1 > Elax </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,980 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 13 October 1916 </td><td class="highlighted"  colspan=1 rowspan=1 > Welsh Prince </td><td class="highlighted"  colspan=1 rowspan=1 > United Kingdom </td><td class="highlighted"  colspan=1 rowspan=1 > 4,934 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 November 1916 </td><td colspan=1 rowspan=1 > Statesman </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 6,153 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 November 1916 </td><td colspan=1 rowspan=1 > Clan Leslie </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,937 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 November 1916 </td><td colspan=1 rowspan=1 > Huntsvale </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 5,398 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 November 1916 </td><td colspan=1 rowspan=1 > Arabia </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 7,903 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 November 1916 </td><td colspan=1 rowspan=1 > Kapunda </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,383 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 December 1916 </td><td colspan=1 rowspan=1 > Bretwalda </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 4,037 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 14 December 1916 </td><td colspan=1 rowspan=1 > Russian </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 8,825 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 14 December 1916 </td><td colspan=1 rowspan=1 > Westminster </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 4,342 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 24 February 1917 </td><td colspan=1 rowspan=1 > Miaoulis </td><td colspan=1 rowspan=1 > Greece </td><td colspan=1 rowspan=1 > 2,918 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 26 February 1917 </td><td colspan=1 rowspan=1 > Clan Farquhar </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 5,858 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 27 February 1917 </td><td colspan=1 rowspan=1 > Brodmore </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 4,071 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 28 February 1917 </td><td colspan=1 rowspan=1 > Shinsei Maru </td><td colspan=1 rowspan=1 > Japan </td><td colspan=1 rowspan=1 > 3,060 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 26 March 1917 </td><td colspan=1 rowspan=1 > Ledbury </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 3,046 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 April 1917 </td><td colspan=1 rowspan=1 > Vasilefs Constantinos </td><td colspan=1 rowspan=1 > Greece </td><td colspan=1 rowspan=1 > 4,070 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 May 1917 </td><td colspan=1 rowspan=1 > British Sun </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 5,565 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 May 1917 </td><td colspan=1 rowspan=1 > Repton </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 2,881 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 26 May 1917 </td><td colspan=1 rowspan=1 > Dorothy </td><td colspan=1 rowspan=1 > Greece </td><td colspan=1 rowspan=1 > 4,494 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 June 1917 </td><td colspan=1 rowspan=1 > HMS Grafton </td><td colspan=1 rowspan=1 > Royal Navy </td><td colspan=1 rowspan=1 > 7,350 </td><td colspan=1 rowspan=1 > Damaged </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Sunk: Damaged: Total: </td><td colspan=1 rowspan=1 > 99,176 7,350 106,526 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
When were the Elax and Welsh Prince attacked by UB-43?
Answer:
Three days after sinking Elax, UB-43 sank another British ship, the Welsh Prince.