Bank

A building that enables all non-hostile players to transfer goods from their Armies into the safety of their Treasury

The bank is a very special and very important building - harvesting resources, looting tiles, and pretty much any other action within the game will place the collected Resources within your Armies, which has a fixed carrying capacity based on the Units within the army.

While being carried by your Armies, it is susceptible to being robbed by other players - you need to secure your goods!

In order to secure your goods, you need to transfer them into your Treasury, which can be accessed from the Bank.