Two very magical things Manannan possessed: one was a boat called the Ocean Sweeper. The other was a milk-white horse, Enbarr of the Flowing Mane, which could travel over the sea-waves as quickly as it could on land, and never get wet; it could fly through the air, too, more swiftly than the strong wind blows in March. Sometimes, when one or other of the heroes had any great deeds to perform, Manannan would lend his Ocean-Sweeper and his white horse to them, so that they should not fail.
Source: Heroes of the Dawn by Violet Russel #Celtic https://twitter.com/jimfitzpatrick/status/1025054089707757568
