Tarik now proceeded rapidly northward, and was soon joined by his superior, the Emir Musa, who was not, perhaps, without jealousy at his success. As the Arab historians say, the Almighty delivered the idolators into their hand, and gave them one victory after another. As the towns successively fell, they left them in charge of the Jews, to whose revenge the conquest was largely due, and who could be thoroughly trusted; nor did they pause in their march until they had passed the French frontier and reached the Rhone. It was the intention of Musa to cross the European continent to Constantinople, subjugating the Frank, German, and Italian barbarians by the way. At this time it seemed impossible that France could escape the fate of Spain; and if she fell, the threat of Musa would inevitably have come to pass, that he would preach the Unity of God in the Vatican. But a quarrel had arisen between him and Tarik, who had been imprisoned and even scourged. The friends of the latter, however, did not fail him at the court of Damascus. An envoy from the Khalif Alwalid appeared, ordering Musa to desist from his enterprise, to return to Syria, and exonerate himself of the things laid to his charge. But Musa bribed the envoy to let him advance. Hereupon the angry khalif dispatched a second messenger, who, in face of the Moslems and Christians, audaciously arrested him, at the head of his troops, by the bridle of his horse. The conqueror of Spain was compelled to return. He was cast into prison, fined 200,000 pieces of gold, publicly whipped, and his life with difficulty spared. As is related of Belisarius, Musa was driven as a beggar to solicit charity, and the Saracen conqueror of Spain ended his days in grief and absolute want.