In January 1326 Eustace led a band of fifty men to a valley near Rearsby and ambushed and killed the corrupt Baron of the Exchequer and ardent supporter of the Despencers, Sir Roger de Beler, who had previously made threats of violence to Eustace, his family and neighbours. An arrest warrant was issued on 24 January to apprehend those involved in the murder. A further warrant was issued to Henry, Earl of Leicester on 28 February.