It is apparent that the interest of the Undertakers could not be to establish peace in Ireland so long as war might be profitably waged. The new "English interest" thus created was often hostile to the soundest rules of policy and always opposed to the dictates of right and justice; but the double desire to conquer and to convert—to anglicize and Protestantize—blinded many to the lawless means by which they were worked out. The massacre of 400 persons of the chief families of Leix and Offally, which took place at Mullaghmast in 1577, is an evidence of how the royal troops were used to promote the ends of the Undertakers. To Mullaghmast, one of the ancient raths of Leinster, situated about five miles from Athy in Kildare, the O'Moores, O'Kellys, Lalors, and other Irish tribes were invited by the local commander of the Queen's troops, Francis Cosby. The Bowens, Hartpoles, Pigotts, Hovendons, and other adventurers who had grants or designs upon the neighbouring territory were invited to meet them. One of the Lalors, perceiving that none of those who entered the rath before him emerged again, caused his friends to fall back while he himself advanced alone. At the very entrance he beheld the dead bodies of some of his slaughtered kinsmen; drawing his sword, he fought his way back to his friends, who barely escaped with their lives to Dysart. Four hundred victims, including 180 of the name of O'Moore, are said to have fallen in this deliberate butchery. Rory O'Moore, the chief of his name, avenged this massacre by many a daring deed. In rapid succession he surprised Naas, Athy, and Leighlin. From the rapidity with which his blows were struck in Kildare, Carlow, and Kilkenny, he appeared to be ubiquitous. He was the true type of a guerilla leader, yet merciful as brave. While Naas was burning, he sat coolly at the market cross enjoying the spectacle, but he suffered no lives to be taken. Having captured Cosby, he did not, as might be expected, put him to death. His confidence in his own prowess and resources amounted to rashness, and finally caused his death. Coming forth from a wood to parley with a party of the Queen's troops led by his neighbour, the Lord of Ossory, a common soldier ran him through the body with a sword. This was on the last day of June, 1578—a day mournful through all the midland districts for the loss of their best and bravest captain.