 Farther to the east, William Carr Beresford (Marshal of the Portuguese army) led MG Christopher Tilson's British 3rd brigade (1,659 British and ca.600 Portuguese grenadiers by 6 May morning state) and 5,000 Portuguese to link up with Silveira's force.MG Alex Randoll Mackenzie's British 2nd brigade and a large Portuguese force operated on the line of the Tagus river.