Where did the Slige Midluachra Cross the Boyne?

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The article says that the Slige Midluachra crossed the River Boyne at Slane, but according to

The HISTORICAL GEOGRAPHY of EARLY IRELAND WALTER FITZGERALD The Geographical Teacher Supplement No. 1: The HISTORICAL GEOGRAPHY of EARLY IRELAND (1925), pp. iii-vii, 1-101 https://www.jstor.org/stable/41553286

"From the northern slopes of Tara Hill this highway led by way of Duleek to Drogheda, where the Boyne was crossed" (page 87) Eroica (talk) 14:22, 5 February 2017 (UTC)Reply

This source (page 83) says that the Slige Midluachra crossed the Boyne at Brow Ford (Ath Bhroga) near Newgrange. Eroica (talk) 14:30, 5 February 2017 (UTC)Reply

John O'Donovan placed Ath Bhroga at Broadboyne Bridge (Stackallan), about 9-10 km west of Newgrange. Orhnance Survey Letters:Meath, pp. 327-340 Eroica (talk) 13:38, 8 February 2017 (UTC)Reply

On the Tumuli and Inscribed Stones at New Grange, Dowth, and Knowth, George Coffey, The Transactions of the Royal Irish Academy, Vol. 30 (1892 - 1896), pp. 1-96. Another source that discusses this matter (page 87), without coming to a definitive conclusion. Eroica (talk) 18:16, 9 March 2017 (UTC)Reply