 Naval capacity was uneven, with the Republicans retaining a numerical advantage, but with the Navy's top commanders and two of the most modern ships, heavy cruisers "Canarias"—captured at the Ferrol shipyard—and "Baleares", in Nationalist control.The Spanish Republican Navy suffered from the same problems as the army—many officers had defected or been killed after trying to do so.Two-thirds of air capability was retained by the government—however, the whole of the Republican Air Force was very outdated.