This expedition was designed to strike at Napoleon's power on the Dutch coastline and to protect Britain from the threat of French attack. It was marred by military inefficiency, but disease proved an even more serious threat and wiped out almost the entire army of 40,000 men who comprised the expeditionary force.
Editors. "Failure of Walcheren expedition". The Literary Encyclopedia. First published 01 February 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=4423, accessed 10 February 2016.]