Barracks allow players to unlock troops and reduce training time. Upgrading one Barrack will unlock a new troop. Upgrading additional Barracks to the same level will reduce the training time of that troop. The more Barracks at that level, the faster that troop will train!
Be careful! While Barracks are upgrading, they’re unable to train troops. Training time reductions from that Barrack will be unavailable until the upgrade is complete. If all Barracks supporting one troop type are under construction, that troop cannot be trained!
In short:
* Barracks upgrades will unlock a new troop or reduce a troop’s training time
* Troops will train slower (and might become unavailable) when Barracks are under construction
For more information on the Barracks, please visit our official Clash of Clans Blog: Army Training Revamp & Quick Train, or check out the tutorial video below (EN only)!