In my note “The Portuguese fleet according to a British witness in September 1806” on this weblog, I wrote about the British fears for the faith of the Portuguese navy, afraid she would become part of the French imperial navy. So all movements of Portuguese warships were closely observed and immediately reported to the British Admiralty.
Sidney Smith wrote the same day a second letter to the Admiralty. Apparently the visited the leaving ship of the line Principe Real, where he received of the Portuguese warships which were left behind at Lisbon . Those were “S. Sebastiao (64 guns), unserviceable without undergoing large repairs and yet not more than a hulk, the Maria Prima (74), unserviceable, yet not more than a hulk, it was decided to rebuilt her as a floating battery but nothing was done to accomplish this, the Princesa (64), condemned, yet not more than a hulk, it was decided to rebuilt her as a floating battery but nothing was done to accomplish this and finally the Vasco da Gama (74), her repairs were nearly finished so they were to forced to left her behind, her guns were used for the Martino de Freitas and another departing ship. Also the frame of the Principe Regente was left behind, still on stocks. Five frigates stayed behind, the Fenix (48), Perola (44) and Amazone (44) all, needing large repairs and the Tritao (40) and Veney (30, both past repairs.
Source
The Naval Chronicle vol XVIII, p. 507- 509. Digitalized version