The advocates of a slave system, with Harrison’s co-operation, then decided that the Territory should pass into the second grade, which under the Ordinance of 1787 could be done when the population should number five thousand male whites of full age. The change was effected in the winter of 1804–1805, by means open to grave objection.[63] Thenceforward Harrison shared his power with a Legislative Council and a House of Representatives; while the legislature chose a territorial delegate to Congress. The first territorial legislature, in 1805, which was wholly under Harrison’s influence, passed an Act, subsequently revised and approved Sept. 17, 1807, permitting owners of slaves to bring them into the Territory and keep them there for a number of days, during which time the slave might be emancipated on condition of binding himself to service for a term of years to which the law set no limit.[64] The overpowering influence and energy of the governor and his Southern friends gave them during these years undisputed control. Yet the anti-slavery sentiment was so strong as to make the governor uncomfortable, and almost to endanger his personal safety; until at last, in 1808, the issue was fairly brought before the people in the elections. Both in that and in the following year the opponents of slavery outvoted and defeated the governor’s party. Feelings became exceedingly bitter, and the Territory was distracted by feuds which had no small influence on matters of administration, and on the Indian troubles most of all. Between the difficulties of introducing negroes and expelling Indians, Harrison found that his popularity had been lessened, if not lost.[65] He could not fail to see that a military exploit was perhaps his only hope of recovering it; and for such an exploit he had excuses enough. The treaties of 1804–1805, which threatened the Indians with immediate loss of their hunting-grounds in the Wabash valley, caused a fermentation peculiarly alarming because altogether new. Early in 1806 Harrison learned that a Shawanee Indian, claiming to be a prophet, had gathered a number of warriors about him at Greenville, in Ohio, and was preaching doctrines that threatened trouble. Harrison attributed the mischief to the Prophet; but he learned in time that the Prophet’s brother Tecumseh--or more properly Tecumthe--gave the movement its chief strength.