As with other parts of the game, reinforcements are limited in how they can be used. It doesn't matter if the player tells you to use them in any way you see fit, the game puts very restrictive limitations on reinforcements. In this account I have the need to attack common and better monsters for valor points, but if someone sends me reinforcements I cannot use them for any monster attacks other than Heroic, or attacking other players cities for conquest points. If I try to use the reinforcements for something else, the game will not allow them to go with my army for whatever other type of attack I might want to complete. In this video I demonstrate how these restrictions make the reinforcements useless, but players have to remember the game maker's priority is to force players to buy packs and spend a lot of money out of their pockets to progress in the game.