Without a warehouse, only a few resources can be stored in your village. Click on any available free building site in your village! Search for the warehouse in the infrastructure tab of the construction menu and start construction. 

Construction work has begun and soon you will have enough storage for your production and loot. I will give you one day of Travian PLUS, which allows you to queue a second construction order while the first one is still not finished.

Your reward: One day of Travian PLUS. Click the ‘Collect reward’ button to receive this and continue on.

Task 9