Gallant was a large black animal, bulkier and squatter than Sureblood, Adolin’s horse. Gallant looked like a warhorse even when compared to other Ryshadium. So far as Adolin knew, no man had ever ridden him but Dalinar. Ryshadium were finicky that way. It had taken a lengthy explanation from Dalinar to even get the horse to allow Adolin to hold the reins, let alone climb into the saddle.
Adolin wouldn’t dare ride Gallant into battle; he was pretty sure the beast would throw him off and run away, looking to protect Dalinar. To him, it felt odd climbing on a horse that wasn't Sureblood.*