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-185
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 > 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 > 7 December 1942 </td><td colspan=1 rowspan=1 > Peter Mærsk </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 5,476 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 March 1943 </td><td colspan=1 rowspan=1 > Virginia Sinclair </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 6,151 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 March 1943 </td><td colspan=1 rowspan=1 > James Sprunt </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 7,177 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 April 1943 </td><td colspan=1 rowspan=1 > John Sevier </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 7,176 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 7 July 1943 </td><td class="highlighted"  colspan=1 rowspan=1 > James Robertson </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 7,176 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 7 July 1943 </td><td class="highlighted"  colspan=1 rowspan=1 > Thomas Sinnickson </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 7,176 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 7 July 1943 </td><td class="highlighted"  colspan=1 rowspan=1 > William Boyce Thompson </td><td colspan=1 rowspan=1 > United States </td><td class="highlighted"  colspan=1 rowspan=1 > 7,061 </td><td class="highlighted"  colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 July 1943 </td><td colspan=1 rowspan=1 > S.B. Hunt </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 6,840 </td><td colspan=1 rowspan=1 > Damaged </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 August 1943 </td><td colspan=1 rowspan=1 > Bagé </td><td colspan=1 rowspan=1 > Brazil </td><td colspan=1 rowspan=1 > 8,235 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 August 1943 </td><td colspan=1 rowspan=1 > Fort Halkett </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > 7,133 </td><td colspan=1 rowspan=1 > Sunk </td></tr>
</table>
Question:
What date and which ships were sunk by U-185?
Answer:
On 7 July, U-185 attacked and sunk the ships James Robertson, Thomas Sinnickson, and the 7,061 ton tanker William Boyce Thompson.