Text: The many little alleys, or yards, as they're called, were used to protect herds of sheep brought down from the fells during times of crisis.
Entailment: The many little alleys, or yards, as they're called, were used to protect herds of sheep as they were brought down from the fells during times of crisis.
Contradiction: The many little alleys, or yards, as they're called, were used to protect herds of dogs brought down from the fells during times of crisis.