When Transport Barges become Transport Galleons, they gain +40 hit points. However, like its predecessor, it still moves fairly slowly and is extremely vulnerable to most attacks, especially from Light Ships and garrisoned defense structures. Therefore, landing operations should always be secured by warships and the coastline should be cleared of any Towers, Forts and city garrisons before the landing force arrives.
Like all transport ships, Transport Galleons cannot be built – a land unit will automatically embark on a transport vessel, when ordered to cross the sea (e.g. ordered to move to another landmass). However, a nation must have researched Science 1 (Written Word) and own at least one Dock to make sea transports possible in the first place. The unit's hit point percentage is transferred to the transport. For as long as a unit is embarked, it cannot attack nor use any of its active or passive abilities.