Water storage tanks, wells and aqueducts are known at several forts, but not all of these forts necessarily held mounted units. Water is necessary for a variety of purposes, besides the obvious drinking and bathing, so it cannot be stated that the tanks at Benwell, Brough-on-Noe or Gellygaer necessarily supplied horses. But it is amply demonstrated that the Romans took considerable care over the provision of water, and therefore the supply of drinking water for cavalry horses and baggage animals would not have been a problem, save in circumstances of severe drought and at some times on campaigns.