sentences:  Teams larger than six are generally limited to situations where large loads must be hauled over difficult ground.For example, eight-ox plowing teams were once common on the heavy soils of southern England, as were very large ox teams used in 19th century South Africa (see ox-wagon).Twenty-mule teams were used in the mid-19th century for hauling ore in California, and large teams of horses were often needed to pull the heaviest types of horse artillery.