Note: This mod requires you to have the official DLCHorseArmor plugin. It won't be able to install if you don't since it patches the DLCHorseArmor.esp.

From the readme:

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DLCHorseArmor with Horse Command Version 1.1
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by WildFlower


History
===================
Version 1.1: 09 April 2006
+ Improved the horse AI
-- horses will keep a larger distance towards the player when he or she engages in combat or sneaks around
-- horses will stay passive when the player is sneaking around

Version 1.0: 07 April 2006
- Initial Release


Lore
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Snak gra-Bura at Chestnut Handy Stables is willing to share some of the knowledge with you that she gained after years of working with horses.

Not only will she show you how you can make a horse react to your whistles, she'll also train your horse to differentiate between traveling, open combat and sneaking.


About
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This mod was inspired and build uppon the "Horse Commands 1.21" mod from xebeth that unfortuantley didn't work with the offical DLCHorseArmor plugin. In order to make the mod work with the armored horses, the scripts had to be rewritten almost completley and merged with the official plugin. The sound files were taken from xebeth's mod as is. Due to the nature of the DLCHorseArmor plugin, support for commanding more than one horse at a time was lost.

This mod will patch the original DLCHorseArmor.esp and adds support for commanding your horse.

It adds a minor power called "Command Horse". Casting it once will have your horse follow you around, casting it again makes the horse stay put.