Horse collar in the context of Windpipe

The first evidence of horses in warfare dates from Eurasia between 4000 and 3000 BC. A Sumerian illustration of warfare from 2500 BC depicts some type of equine pulling wagons. By 1600 BC, improved harness and chariot designs made chariot warfare common throughout the Ancient Near East, and the earliest written training manual for war horses was a guide for training chariot horses written about 1350 BC. As formal cavalry tactics replaced the chariot, so did new training methods, and by 360 BC, the Greek cavalry officer Xenophon had written an extensive treatise on horsemanship. The effectiveness of horses in battle was also revolutionized by improvements in technology, such as the invention of the saddle, the stirrup, and the horse collar.

Many different types and sizes of horses were used in war, depending on the form of warfare. The type used varied with whether the horse was being ridden or driven, and whether they were being used for reconnaissance, cavalry charges, raiding, communication, or supply. Throughout history, mules and donkeys, as well as horses played a crucial role in providing support to armies in the field.

A horse harness is a device that connects a horse to a horse-drawn vehicle or another type of load to pull. The two main designs of horse harness are the breast collar and the full collar. The trade that makes harnesses is a saddler or harness maker.

For pulling heavy loads, a full collar is required because it distributes pressure over a larger area of the horse. An ill-fitting full collar can cause chafing on the horse's skin and can interfere with its breathing, as can a breast collar that is positioned too high.