Also that year, the 2nd Battalion's flank companies took part in the disastrous Walcheren Expedition in the Low Countries, a campaign that would suffer many casualties from disease rather than the bullet of an enemy, through Walcheren Fever, which affected the troops that suffered from it so severely that many thousands of the troops still suffered from it years afterwards, and led to the Duke of Wellington stating that he did not want any unit that served in the Walcheren Campaign to serve with him.