Each Mongol soldier typically maintained 3 or 4 horses Changing horses often allowed them to travel at high speed for days without stopping or wearing out the animals. Their ability to live off the land, and in extreme situations off their animals (mare's milk especially), made their armies far less dependent on the traditional logistical apparatus of agrarian armies. In some cases, as during the invasion of Hungary in early 1241, they covered up to 100 miles (160 km) per day, which was unheard of by other armies of the time.