In 1327 his nephew Rory, son of Sitriug, was killed during the Battle of Fiodh-an-Átha, a raid on the English village of Finnea, County Westmeath led by the first cousin of Tomás, Ualgarg Mór Ó Ruairc (died 1346) who was King of West Breifne from 1316 until his death in 1346.
The people of the town rose against him and defeated him and Art O Ruairc, an eligible prince of Brefne, was killed, with many others, gentle and simple.
John Pembridge's Annals for 1331 state- Item, apud Ffynnagh in Midia, strages Hibernicorum per Anglicos ejusdem terre undecimo die mensis Junii.
Mag Shamhradhain went to the house of Ua Concobuir the same year and he came back again and on his return an attack was made by the Clann-Muircertaigh and by Muinter-Eoluis and by the muster of the Breifni, both Foreigner and Gallowglass, on him.
Magauran (i.e. Thomas) afterwards went to the house of O'Conor; but, on his return, the Clann-Murtough, and the Muintir-Eolais, assembled to meet him, and took him prisoner, after having slain many of his people.
Afterwards Mag Samradain went to O Conchobair's house, and as he was coming away the Clan Murtagh and the Muinter Eolais assembled to intercept him, captured him and killed many of his men.
The Annals of Loch Cé for 1339 state- Thomas Mac Samhradhain, who was detained a prisoner by the Clann-Muirchertaigh, was set at liberty.
In due course the Chieftain of Tullyhaw sallied forth across the 'Grey Ridge County' for his bride, but the winsome Una O'Connor, who was already plighted refused, to marry McGovern.
He persisted but the Clan Murtagh O'Connor of Sligo and the Muintir Eolus of Leitrim took McGovern and never dropped him until they landed in his native Derrynananta, Glangevlin and on the way they subjected him to frequent 'possings' in the ditches.
There was also conflict in 1337 with the Anglo-Irish Costello family The Annals of Ulster for 1337 state- William, son of Gilbert Mac Goisdelb, was killed on a night-foray in the Breifni by the Tellach-Eachach.
The Annals of the Four Masters for 1340 state- William, the son of Gilbert Mac Costello, was slain in a conflict in Breifny by the people of Teallach-Eachdhach.
The Annals of Connacht 1340 state- Uilliam Mac Gosdelb, the son of Gilliberd, was killed on an attack in Brefne by the Tellach Echach.
The Annals of Loch Cé for 1340 state- William Mac Goisdelbh, son of Gilbert, was slain in a conflict in the Breifne, by the Tellach-Echach.
He had blue-green eyes, red lips, white teeth and a smooth clean-shaven ruddy face with a tendency to blush.
Tomás had an army of 700 horsemen armed with spears made of red shafts of ash-wood having blued-steel points, to which were attached bright satin pennants.