[3] Captain Thomas Roberts received a letter of marque for Backhouse on 18 December 1800.

Whaling voyage #1 (1801–1803): Backhhouse sailed in 1801 with Hugh Wyer (or Weyer), master.

Her owner was Mather & Co.[5] Whaling voyage #2 (1803–1805): Backhouse, Tristram Bunker, master, left Britain on 1 February 1803, bound for the Galapagos Islands.

[5] Lloyd's Register for 1805 showed Backhouse changing hands again, and undergoing repairs.

Her owner became Captain & Co., her master was Kelly, and her trade was now London-West Indies instead of London-Chilli.