Copy attachment from one custom list to another

Could someone let me know on how to copy the attachment(s) from one customlist to another.

I tried using CopyIntoItemsLocal but it didnt help. Below is the SOAP request.

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <CopyIntoItemsLocal xmlns="http://schemas.microsoft.com/sharepoint/soap/">
            <SourceUrl>http://<<servername>>/Lists/L1/Attachments/5/sample.jpg</SourceUrl>
            <DestinationUrls>http://<<servername>>/Lists/N1/Attachments/1/test.gif</DestinationUrls>
        </CopyIntoItemsLocal>
    </soap:Body>
</soap:Envelope>

When I run this workflow, it works fine but attachment didnt get copied.

Thanks in advance.

-Riaz