Ring of Command

Ring of Command is an item which has a chance to drop after successfully defending an Item Island. A Ring of Command can be given to your commanders in order to increase their total number of soldiers in their unit. A level 1 Ring of Command increases the unit's size from 9 to 12 and can be upgraded to level 2 for 16 coins which further increases the unit's size to 16.

As with almost every item in the game, once it is assigned to a commander, it cannot be removed. You can choose Ring of Command as a starting item once you have unlocked it.

Recommended

 * For Archers, it's highly recommended over Infantry as to increase their total number of arrows fired, their survivability and don't often need to rotate as Infantry do so the increased time to replenish the squad is usually not a issue.
 * For Infantry, as the increased manpower will result in higher damage and survivability of the unit.

Not Recommended

 * For Pikes, as they should never get in trouble enough to need the indirect extra survivability of the ring's effect and their damage output.

Cons

 * Using this item increases the time it takes to replenish the unit.

Trivia

 * Ring of Command will increase the number of soldiers behind your commander's portrait, which is easily recognizable once the ring is upgraded to level 2.RingofCommandAvatar.PNG

Link
*Source : http://badnorth.wikidot.com/ring-of-command