Unfortunately there was no golden cargo to send back with him. As much gold as possible was scraped together, but it was very little. The usual assortment of samples of various island products was also sent; but still the vessels were practically empty. Columbus must have been painfully conscious that the time for sending samples had more than expired, and that the people in Spain might reasonably expect some of the actual riches of which there had been so many specimens and promises. In something approaching desperation, he decided to fill the empty holds of the ships with something which, if it was not actual money, could at least be made to realise money. From their sunny dreaming life on the island five hundred natives were taken and lodged in the dark holds of the caravels, to be sent to Spain and sold there for what they would fetch. Of course they were to be "freed" and converted to Christianity in the process; that was always part of the programme, but it did not interfere with business. They were not man-eating Caribs or fierce marauding savages from neighbouring islands, but were of the mild and peaceable race that peopled Espanola. The wheels of civilisation were beginning to turn in the New World. After the capture of Caonabo and the massacre of April 25th Columbus marched through the island, receiving the surrender and submission of the terrified natives. At the approach of his force the caciques came out and sued for peace; and if here and there there was a momentary resistance, a charge of cavalry soon put an end to it. One by one the kings surrendered and laid down their arms, until all the island rulers had capitulated with the exception of Behechio, into whose territory Columbus did not march, and who sullenly retired to the south-western corner of the island. The terms of peace were harsh enough, and were suggested by the dilemma of Columbus in his frantic desire to get together some gold at any cost. A tribute of gold-dust was laid upon every adult native in the island. Every three months a hawk's bell full of gold was to be brought to the treasury at Isabella, and in the case 39 of caciques the measure was a calabash. A receipt in the form of a brass medal was fastened to the neck of every Indian when he paid his tribute, and those who could not show the medal with the necessary number of marks were to be further fined and punished. In the districts where there was no gold, 25 lbs. of cotton was accepted instead.