Byzantine Cavalry Basics
Most cavalry consisted of archers who trained first on foot, then on horseback. They could shoot in either the Roman or Persian manner, that is, using either a thumb lock or a finger release, the former adopted from the Huns. The Hunnic method afforded a faster delivery. Practice was to be carried out on a fast-moving horse, preferably on a route march to conserve the horse's energy, and the rider should shoot both straight ahead and to the rear, both to right and left. Speed and dexterity were vital, the archer being expected to shoot, replace his strung bow in its case, grasp and manipulate the spear carried on his back, replace it, and once again take up his bow. He needed a level-headed horse who did not quicken once the reins were slackened, nor as the rider shifted his position for the various releases. Above all, whether the rider was loosing arrow, lance, javelin or spear, the horse had to keep a straight course, an even pace, and a lowered head and neck to facilitate the rider's aim.
The full panoply of the higher-ranking Byzantine cavalrymen consisted of ankle-length hooded mail coat, gorget, small plumed helmet, bow and bowcase, covered quiver for thirty to forty arrows, two cavalry lances of Avar type, and sword. In his baldric the soldier carried an awl and a file for on-the-spot mending of gear and sharpening of weapons. His clothing consisted of a roomy tunic, fixed at the knee when riding (this helped to prevent the pinch and chafe of stirrup leathers), which suggests a garment rather like trousers. The outer covering was a large felt cloak, both for wet weather and to mask the gleam of mail when on patrol. It also gave some protection against arrows.
The horse's tack consisted of a saddle with stirrups, a thick saddle pad, a good-quality bridle, a capacious saddle bag to carry three or four days' iron rations, and spare bowstrings. No doubt other essentials were also carried, such as hoof picks, strips of leather [thong] for saddlery and personal gear repair, etc., plus some food for the horse along with the soldier's own rations, and a lasso with a thong and a pair of hobbles. Wicker cages were provided for carrying mail coats when not in use. During battle or when on a raid one of these containers was attached behind the saddle of the soldier's charger to protect the mail coat against the elements, and so that the soldiers could unburden themselves when they were not needed.
The thick saddle pad protected the horse's back from saddle sores and pressure galls, which could have put it out of action, and also gave some protection against arrows or other weapons.