|Location||The grasslands, the Unknown|
|Inhabitants||Gregory, the Commonwealth crew|
The washtub barge is a giant wooden washtub with an attached washboard. It also has a deck and mast like those of a ship.
After sailing for a short time on the Commonwealth soldier's old bicorne, Gregory snuck away with his frog and found the washtub barge. When Wirt crashed the bicorne into the washtub, Gregory declared himself an enemy of the Commonwealth. He was shortly defeated by the baby soldier and banished from the Commonwealth. The four Commonwealth soldiers then sailed away in the washtub barge.