The very next time we slipped out for some fetchin' trade, we met Mus' Stenning's boat over by Calais sands; and he warned us that the Spanishers had shut down all their Dutch ports against us English, and their galliwopses was out picking up our boats like flies off hogs' backs. Mus' Stenning he runs for Shoreham, but Frankie held on a piece, knowin' that Mus Stenning was jealous of our good trade. Over by Dunkirk a great gor-bellied Spanisher, with the Cross on his sails, came rampin' at us. We left him. We left him all they bare seas to conquest in.
This is from ""Simple Simon" in "Rewards and Fairies"by Kipling.
I do not understand the meaning of
---Frankie held on a piece,
---We left him all they bare seas to conquest in.
I am glad if somebody kindly teach me.