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:
Rolla (1805 ship)
Table title:
Merchantman again, and fate
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Launch year </th><th colspan=1 rowspan=1 > Master </th><th colspan=1 rowspan=1 > Owner </th><th colspan=1 rowspan=1 > Trade </th></tr>
<tr> <td colspan=1 rowspan=1 > 1811 </td><td colspan=1 rowspan=1 > A. Gordon </td><td colspan=1 rowspan=1 > Conyers and Nixon </td><td colspan=1 rowspan=1 > Falmouth-Senegal </td></tr>
<tr> <td colspan=1 rowspan=1 > 1812 </td><td colspan=1 rowspan=1 > A. Gooden J. Forbes </td><td colspan=1 rowspan=1 > Nixon & Co. </td><td colspan=1 rowspan=1 > London-Grenada London-Mogadore </td></tr>
<tr> <td colspan=1 rowspan=1 > 1813 </td><td colspan=1 rowspan=1 > R. Douglas </td><td colspan=1 rowspan=1 > Nixon & Co. </td><td colspan=1 rowspan=1 > London-Malta </td></tr>
<tr> <td colspan=1 rowspan=1 > 1814 </td><td colspan=1 rowspan=1 > R. Douglas W. Gray </td><td colspan=1 rowspan=1 > Nixon & C9. </td><td colspan=1 rowspan=1 > London-Corunna </td></tr>
<tr> <td colspan=1 rowspan=1 > 1815 </td><td colspan=1 rowspan=1 > W. Grey J. Wallace </td><td colspan=1 rowspan=1 > Hodgson </td><td colspan=1 rowspan=1 > London–Gibraltar London-New York </td></tr>
<tr> <td colspan=1 rowspan=1 > 1816 </td><td colspan=1 rowspan=1 > J. Wallace Anderson </td><td colspan=1 rowspan=1 > M'Guire </td><td colspan=1 rowspan=1 > London-New York London-Brazils </td></tr>
<tr> <td colspan=1 rowspan=1 > 1817 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Lloyd's Register not published </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1818 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1819 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1820 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1821 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1822 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1823 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1824 </td><td class="highlighted"  colspan=1 rowspan=1 > Cowley </td><td class="highlighted"  colspan=1 rowspan=1 > Hancock </td><td class="highlighted"  colspan=1 rowspan=1 > Liverpool-Brazils </td></tr>
</table>
Question:
What happened when Rolla's trade became Liverpool-Brazils?
Answer:
After Rolla's trade became Liverpool-Brazils in 1818, Rolla's master changed from J. Wallace Anderson to Cowley and Rolla's owner changed from M'Guire to Hancock.