sentences:  The 4th Volunteer Battalion, King's Royal Rifle Corps (formerly the 5th (West Middlesex) Volunteer Rifle Corps), joined the Middlesex Regiment as the 9th Battalion.The 10th Battalion was formed by a nucleus of 300 officers and men from the disbanded 2nd (South Middlesex) Volunteer Rifle Corps.The four TF battalions constituted the Middlesex Brigade in the Home Counties Division.