Lancaster's army arrived at Boroughbridge on 16 March. The rebels were greatly outnumbered; while Harclay commanded around 4000 men, Lancaster only had some 700 knights and men-at-arms, with followers, in his service. In addition to this, the loyalist forces were highly trained and experienced from the Scottish Wars. Harclay used tactics the English had learned from the Scots in these wars. The Lanercost Chronicle describes how Harclay employed the Scottish "schiltron" – a compact formation of infantrymen with pikes or spears, highly effective against Lancaster's cavalry-heavy forces. According to "The Brut", Lancaster tried to persuade Harclay to join his side, in return for great rewards in land. Harclay had previously been a supporter of Lancaster, possibly also the earl's retainer; in 1318, a general royal pardon for Lancaster and his adherents contained Harclay's name. On this occasion, however, Harlay decided to remain loyal to the king, and turned down the earl's offer.