As may be surmised no great number of slaves was exported from Barbadoes or Jamaica on this contract. Only one ship arrived at Barbadoes from Cadiz desiring to secure one thousand slaves, but the company's factors could obtain only eight hundred. Lord Willoughby carefully reported that he had complied with his Majesty's command not to exact any export duty for these slaves.[88] In Jamaica fewer Negroes are known to have been sold on this contract to Spanish ships which came from Cartagena.[89] There may have been other instances of sales not recorded, but it is certain that the war interfered to such an extent that the number of Negroes sold to Grillo fell far short of what the contract called for. In order to keep the agreement intact the company resolved, March 23, 1666, to lay the situation before the king, and to ask him to permit Grillo's agents to buy sufficient Negroes in the plantations to make up the required number, and that no export duties be charged on them.[90] The king complied with the company's request, and the desired orders were sent to the governors of Jamaica and Barbadoes.[91] Some trouble had arisen in Jamaica, however, between Grillo's agents and Governor Modyford. Since the company believed that Grillo's agents were primarily to blame for this, it resolved in the future to deliver Negroes only at Barbadoes in return for ready money.[92] This was virtually the end of the contract. In 1667 the company spoke of the agreement as having been broken by the Grillos, and that it was under no further obligation to carry out its terms. Altogether, it declared, that no more than 1,200 Negroes had been delivered to Grillo's agents.[93] Thus this project which the company at first asserted would bring into the English kingdom 86,000 pounds of Spanish silver per year[94] ended in this insignificant fashion. Although the Grillo contract and the other attempts to begin a slave trade with the Spanish colonies had proved much less successful than the Company of Royal Adventurers had hoped, a great deal had been accomplished toward bringing to light the fundamental difficulties of this trade. In the first place not much could be accomplished in the way of developing this trade so long as the Spanish government maintained its attitude of uncompromising hostility toward all foreigners notwithstanding the fact that the Spanish colonists would gladly have welcomed the slave traders. Furthermore, although the English government had signified its willingness to disregard the restrictions of the Navigation Acts in this instance, the hostile attitude assumed by the planters toward the trade in slaves to the Spanish colonies also had to be taken into consideration. Whenever the planters were able to do so they endeavored to prevent the exportation to the Spanish colonies of slaves which they maintained were very much needed on their own plantations.