On February 16, 1595, a Gaelic Irish force assaults and captures the English-held Blackwater Fort at Blackwatertown in County Armagh, during the Nine Years’ War. The Irish are led by Art MacBaron O’Neill, brother of Hugh O’Neill, Earl of Tyrone, and marks Tyrone’s break with the English Crown as he openly wages war against the English forces in Ireland.

The assault focuses on the English fort which sits at a bridge on the River Blackwater, marking the border between Counties Tyrone and Armagh. It is built by Walter Devereux, 1st Earl of Essex, in 1575 as an outpost of English military strength in the heart of Gaelic Ulster, but also to secure the power of the main Irish ally in the region, Hugh O’Neill, Baron of Dungannon. The fort is composed of a square earthwork bawn “twelve score yards in circuit” reinforced by two bulwarks and punctuated with gun loops in its ramparts. In one corner stands a wooden tower, four stories tall, topped with a wooden walkway and a slate-covered building. It is accessed by two doors, one leading out onto the ramparts, another leading to a cellar. Each story has defensive firing loops, also known as spike holes. This tower overlooks a road and bridge across the river. At the other side of the river, on the Tyrone side, is a stone tower. The stone tower controls access to the bridge, as the road runs through it via large wooden doors.

Hugh O’Neill, Lord of Tyrone, is thought an ally of the English Crown and he is supported by the English authorities in Dublin as a counterweight to the power of other native lords in Ulster such as Turlough Lynagh O’Neill. However, encroachment by English authorities on the liberties of the native Irish lords in Ulster during the 1580s and early 1590s causes O’Neill to create an alliance of Irish lords, which look to throw off English rule with the help of Philip II of Spain. From April 1593, O’Neill orchestrates a proxy war against the English using Hugh Maguire, Lord of Fermanagh, and Hugh Roe O’Donnell, Lord of Tyrconnell. They engage the English in the west of Ulster while O’Neill, outwardly still loyal to the Crown, strengthens his power base in Ulster and subdues the Crown’s Irish allies in the north. The Irish lay siege to Enniskillen Castle and defeat an English force sent to relieve it.

O’Neill’s alliance is not limited to Ulster as he is allied to Fiach McHugh O’Byrne in Leinster. He has come under increasing pressure from Lord Deputy William Russell‘s military expeditions into the Wicklow Mountains. In desperation, Fiach McHugh asks that Tyrone offer help or at least raid the northern Pale to draw Russell out of Wicklow. O’Neill requests a meeting with Russell to discuss how to proceed but this is dismissed by the Lord Deputy as a ploy to draw him out of O’Byrne’s lands. Therefore, to help O’Byrne, O’Neill makes his first open move against the Crown.

On the morning of Sunday, February 16, 1595, Art MacBaron O’Neill approaches the fort from the direction of Armagh with 40 men, escorting what appears to be two prisoners. As they cross the bridge one of the English warders notices the match cords of the Irishmen’s matchlock calivers are lit, a sign that they are ready to fire. The English open fire and MacBaron’s men force their way into the stone tower, but the English withdraw to the upper stories and prevent the Irish from taking the tower. Meanwhile, on the other side of the river, 200 Irish soldiers sweep over the earth ramparts and take the bawn. The English soldiers and their families retreat to the wooden tower. Defensive fire from within keeps the Irish back and twice the warders thwart MacBaron’s attempts to burn the position. Fifteen of MacBaron’s men are killed attempting to storm the towers, and eight more later die of their wounds. The stalemate lasts until five o’clock in the evening when MacBaron calls for a ceasefire. He offers the garrison terms for their surrender. The English, led by Edward Cornwall, are critically low on ammunition but still prevaricate until MacBaron threatens to burn the fort to the ground with all in it. The ward’s surrender is agreed and MacBaron guarantees their safe passage to Newry.

The loss of the fort is doubtless a military setback for the Crown, but of more significance is the presence of the Earl of Tyrone in person. According to the English commander, O’Neill arrives after the surrender and is outraged at the losses suffered in taking the fort and is angry that the defenders had not been executed. After the English soldiers and their families leave, O’Neill looks on as the bridge is demolished and the fort’s defence slighted. Up until this point there is no concrete proof that O’Neill was active in the attacks by Maguire and O’Donnell in the west of Ireland. Now there is indisputable proof that the Crown was at war with O’Neill.

(Pictured: The Blackwater Fort at present-day Blackwatertown in County Armagh, built by the Earl of Essex during a foray into Ulster in 1575 and captured and destroyed by the Irish in 1595. This pen and ink sketch measures 22½ by 16½ inches and is dated March 27, 1587.)