Barry Roe and Barry Oge also gave security. The army then shifted to O'Callaghan's country, and near Dromaneen James Fitzjohn came to the other side of the flooded Blackwater and defied Grey. He would, he said, conclude nothing without the advice of O'Brien, who could dispose of all the Irishry of Ireland. Grey could not pass the river, and returned to Cork. John Travers, a native of Ireland who had learned the art of war elsewhere, had lately been appointed Master of the Ordnance, and accompanied this expedition, in which only 800 men were employed. Travers said that he would go anywhere in Ireland with 2,000 men, and Grey's exploits, no less than Sidney's later, show that he was right: the difficulty was not to take but to keep. 'Six thousand good men,' Travers added, 'divided in three places as I could give instruction, with certain craftsmen to inhabit the places they win, might make a general reformation in one summer.' The advice was sound, but the Crown could not afford to take it.[228] [Sidenote: Grey's last raid into Ulster.] Once more before young Gerald had left Ireland did Grey turn his attention to the North. For the third time O'Neill promised to meet him, and for the third time he failed to appear. Without victuals, and trusting to plunder for the support of his men, the Lord Deputy then rode 'thirty-four miles of ill way' to Dungannon, and again nearly caught the troublesome chief. But the guides, perhaps intentionally, delayed the soldiers on their night march, and daybreak found them still five miles from Dungannon. O'Neill had time to escape. Six days were spent in promiscuous burnings, during which the soldiers had no bread and lived on freshly killed beef: it is no wonder that disease was rife in the ranks. This was Grey's last warlike expedition; successful in a certain sense, but quite useless as a matter of policy.[229] [Sidenote: Recall of Grey. Consequent confusion.]