During the winter of 1537-1538, the naval yards of Constantinople were busy with the preparations for a new fleet which should take the offensive against the Venetians and the Christians generally. In the spring Barbarossa got out into the Archipelago and, raiding at will, swept up another batch of prisoners to serve as galley slaves for the new ships. Meanwhile, the Mediterranean states nerved themselves for a final effort. Venice contributed 81 galleys, the Pope sent 36, and Spain, 30. Later the Emperor sent 50 transports with 10,000 soldiers, and 49 galleys, together with a number of large sailing ships.