In Middle-Earth, there are many factions battling against one another. These factions all have at least one Horn of Conquest, which is used to summon reinfocements or to launch invasions. I beleive it is time for another use for horns.
War Horns: Crafted with any type of horn on the faction crafting table, with an ingot the faction uses (Mordor uses orc steel, Gondor uses iron, etc) on each side: one on top, one on the bottom, and one on the left and right on the grid. Each faction would get their own style of War horn, some of them being similar to other factions, or even the same. These horns would have the same effect as a banner bearers , meaning they give a small buff, as well as summoning a small number of units, no more than 4.
But each horn would get a sound that goes with it (Some are the same). These sounds will also replace the Horn of Conquest sounds, if possible.
Note, these horns would have 3 uses, and have a large cooldown of 2 minutes. This cooldown would be similar to that of attack cooldown.
List of Sounds:
Hobbits: The same sound as a Shirriff Chief attack.
Dunedain of the North/Gondor : Similar to the three blasts used by Boromir when he was in trouble.
All Dwarves/Dale: A longer and lower pitched version of the default Horn of Command. If possible, the horn used at Erebor.
All Elves : A long, continuous sound, similar to a rams horn. Wood-Elves might get this.
Gundabad/Angmar/Dol Guldur/Moria Orcs(If added): A long, metallic horn, similar to this.
Dunland: Low pitched Horn of Command
Isengard: The Horn of Command blown twice, lower pitched.
Fangorn: Possibly none
Rohan : Similar to the Horn of Command, but smoother and a little longer
Mordor : Similar to the Isengard horn except one blast. Could also use Gundabad horn.
Near Harad: Similar to this.
Tauredain/Moredain/Half-troll: Possibly a ram's horn
Khaganate : Similar to Rohan but different tone