On 17th March, 1839, the "Achilles" departed the port of Plymouth, England.
The "Achilles" was a barque vessel weighing 335tons. Its master was Mr. Veale. The "Achilles" was bound for Sydney and arrived on 24th July 1839.
On board were 14 passengers (including 5 children). Records show that in steerage were a Mr. and Mrs. Sparks.
It is my opinion that this is William Jackson Sparkes and his wife Mary Ann. It is recorded that they were unassisted migrants.