
The Williamite army pitched camp at Tullyallen, on the high ground north of the river, on 30th June. In the evening, at a council of war, Schomberg, supported by some of the other generals, advocated an attack across the river at Oldbridge as a diversion, while the main army was concentrated upstream against the Jacobite left flank. Other generals, noteably Count Solms of the Dutch Guards, were against this plan and William opted for a compromise: the main assault would be at Oldbridge, but a flank attack upstream by a third of the army would precede it. The day started misty but soon cleared. Shortly after dawn Meinhard Schomberg, Schomberg's son, and Douglas, the Scottish lieutenant-general, set off upstream to the west with 10,000 men. The Irish had broken the bridge at Slane, but a few miles downstream the Williamites found a ford at Rosnaree. William forded the Boyne further downstream near Drybridge, and placing himself at the head of a substantial force of cavalry, charged the Jacobite right flank and won the day.
Please Note Source of information on this page is from Calton Protestant Defenders Loyal Orange Lodge No.221