Amongst the Portuguese who escaped slaughter at the hands of Muhammad Granye was Pedro Leon, who had been body-servant to Christophoro da Gama. Assisted by the advice of this little band of Portuguese heroes, the Emperor of Abyssinia at last made a successful stand against the Muhammadan invader. In the furious battle which ensued, the Portuguese directed all their energies against that part of the Somali army where Muhammad Granye was commanding. Pedro Leon, filled with a holy rage, singled out the Somali king from amongst his men, and shot him through the head with a musket. Muhammad Granye did not die at once, but managed to escape for some distance from the battlefield, being always, however, resolutely followed on horseback by Pedro Leon. At last Muhammad fell down dead, and Leon, having satisfied himself of the fact, cut off one of his ears to prove to the Emperor of Abyssinia that it was he who had avenged Dom Christophoro. After the death of their leader the Muhammadan forces melted away, and Christian Abyssinia slowly recovered from the greatest crisis in its fortunes prior to the Italian invasion of 1896. In 1615[18] a notable advance in Nile exploration was made. Father Pedro Paez was shown by the Abyssinians the sources of the Blue Nile on the Sagada or Sakala Mountain in the western part of the province of Gojam. Paez mentions that the river, before it enters Lake Tsana, is styled the Jemma, a term which scarcely differs from its name at the present day. He also alludes to, though he does not describe very carefully, Lake Tsana.