Suspicion to this effect, though based upon reports more or less vague, had been expressed by the Spanish Minister as early as the February preceding; and had been reiterated by him from time to time,[42] until at the expiration of three months, it had developed into a pretext for delaying the execution of the treaty. In fact, the Baron de Carondelet asserted in a proclamation of May 24, that further delay in surveying the boundary line and in evacuating the forts was then occasioned only by the imperious necessity of securing Lower Louisiana, in case the British should become masters of the Illinois country[43] and that such apprehensions had caused him to put the post at Walnut Hills "in a respectable but provisional state of defence."[44] Secretary Pickering not only considered these suspicions groundless, but contended further that, "If the posts of the Natchez and Walnut Hills 'are the only bulwarks of Lower Louisiana, to stop the course of the British,' as the Baron alerts and if, therefore, Spain is justifiable in holding them, she may retain them, without any limitation of time, for her security in any future war, as well as in that which now exists."[45] Before the appearance of the Baron's proclamation containing this reason for delay, the Spanish Minister had been informed that the Secretary of State saw no reasons for such suspicions and the British Minister had been notified that the Government of the United States would suffer neither British nor Spanish troops to march through its territory for the purpose of hostility of one against the other.[46] The Spanish Minister replied[47], however, that he knew to a certainty that the English had made a proposition to General Clarke of Georgia in order to secure his influence in that State in a proposed attack against Florida. At the request of Mr. Pickering, this report was investigated by the District Attorney of Georgia. He replied that he could not find any one who knew of the matter or who entertained a belief of the report; and that from General Clark's known violent antipathies to the English and other circumstances, he doubted the truthfulness of it altogether.[48] When the attention of Mr. Liston, the British Minister, was directed to the subject, he pointedly denied that his government either had intended or was then intending to invade Louisiana.[49] A few days later, however, he admitted that a plan for attacking the Floridas and other Spanish possessions adjoining the United States had been submitted to him by other persons, whom he declined to name, but stated it was discountenanced by him because its success depended upon a violation of the neutrality of the United States and an enlistment of the Indians. According to this plan, the expedition was to be undertaken by a British sea force, which would be joined by such volunteers of the United States as would join the king's standard when raised on Spanish soil.[50]