In April 1600 Docwra was given an army of 4200 men to subdue
Ulster. He landed at
Carrickfergus, and proceeded to
Culmore, where he fortified both the ruined castle there and Flogh, near
Inishowen,
County Donegal. Proceeding to what is now
Derry, he fortified the hill and laid out the first streets of the new city. Further up the
River Foyle, he fortified Dunnalong, a position dividing Counties Donegal and
Tyrone, in July 1600. He constructed
Dutch-inspired star-shaped
bastion forts, each with a strong earthen rampart, surrounded by a ditch, at the three sites of Culmore, Derry and Dunnalong. He engaged in several skirmishes with the Irish, reportedly winning their admiration for his courage and cunning, and was severely wounded by
Black Hugh O'Donnell, a cousin of
Red Hugh O'Donnell, chief of the
O'Donnell Clan. However, in his early months in Ulster, he showed a certain timidity, which damaged his reputation with the English government. In particular, he was criticised for concentrating his men at Derry, where an
epidemic was raging: so many fell sick that his effective force was reduced to 800 men. Throughout his career in Ulster, he showed remarkable skill in fostering divisions in the leading Irish clans, and he gained the support of several prominent Irish chieftains, including members of the dominant O'Neill and O'Donnell clans. His most notable diplomatic coup was to win for the Crown, at least for a time, the loyalty of
Niall Garve O'Donnell, cousin and brother-in-law of Red Hugh. A charge often levelled against Docwra by his enemies was of his gullibility in believing in the promises of loyalty made by the Gaelic chieftains, and differences over this policy of conciliation later led to a quarrel between Docwra and Mountjoy. In fact, Docwra, who was a sensible man, had no expectation of any of the chieftains remaining loyal "if the Spaniards should approach these shores", or if the English suffered any decisive military defeat at the hands of the Irish. His attitude was simply that, so long as it lasted, the support of men like Niall Garve was a political asset which the English should exploit to its fullest extent. The winter of 1600/1601 was spent in further military expeditions, and in negotiations with the Irish. In 1602 he secured
Dungiven Castle from
Donnell Ballagh O'Cahan, the principal vassal or 'uriaght' of Hugh O'Neill. This gave him control of most of what is now
County Londonderry, and led O'Cahan to switch sides, depriving O'Neill of a large portion of his remaining force. He joined forces with Mountjoy to finally crush
Hugh O'Neill, who made his submission to Mountjoy at
Mellifont in March 1603. The military campaign is said to have been one of exceptional savagery, resulting in the death of thousands of Irish civilians. On the death of Queen
Elizabeth I, it was Docwra's firm action which prevented a rising in the north of Ireland by his chief Irish ally, Niall Garve O'Donnell, who was infuriated at not having been made
Earl of Tyrconnell, a title which was instead conferred on his cousin
Rory O'Donnell. Niall was, in the short term, persuaded to trust in the promise of further rewards from the Crown. Clearly, his loyalty could not be depended on for much longer, but then Docwra had never had any trust in the permanent loyalty of the Gaelic chiefs. ==Founder of Derry==