The treaty concluded with the United States under the guns of Decatur's ships, was more mortifying to the Algerines than any which had previously been made with a Christian nation; captives had been surrendered without ransom, property seized had been restored, and the right of demanding tribute or presents had been distinctly renounced. The Dey saw that his credit would be seriously impaired when these engagements should become publicly known; he suspected that had he held out longer, he might have escaped the humiliation, and he flattered himself that he might still retrieve what had been lost. No Barbary sovereign ever considered it incumbent on him to observe a treaty longer than it was compatible with his interests; yet every man, however rude may be his ideas of moral conduct, knows the advantage of being, or of seeming to be in the right. With these views Omar determined to seek, and he accordingly soon found a pretext for quarrel. It has been stated that the Algerine brig taken by the Americans and sent into Carthagena, had been there detained by the authorities, on the plea of irregularity in the capture, but really in order that the Spanish Government might obtain some concessions from the Dey in return for the vessel. Omar did not fail to express to the Consul, at first his surprise, then his indignation at this delay, which he insisted was a violation of the treaty. Mr. Shaler endeavored to reason with him, and renewed his assurances that the brig would be soon restored; but he became daily more open in his threats, and more insulting in his language, until the Consul not knowing to what lengths his arrogant folly might lead him, requested Commodore Shaw who had just reached Mahon, to come with his whole force to Algiers.