"proved to be Admiral Croft's gig"

Gig, Tilbury Carriage
Creative Commons Attribution Share AlikeGig, Tilbury Carriage - Credit: Joseolgon
A gig was a carriage for one horse and sported two wheels.  In the early 19th century it was also known as a Tilbury Carriage, seen here. It made for fast driving, but, as seen with Admiral Croft and his propensity for spills, it did take some skill in maneuvering.