"Aetna" then formed part of the naval force in the Scheldt under the command of Sir Richard Strachan. At 06:00 on the morning of 28 July 1809 "Aetna", together with the whole fleet in The Downs, set sail for Flushing and that evening they anchored about 18 miles from Walcheren. On the 30th they watched the troops go ashore covered by the frigates.