sentences:  The 43rd Battalion was formed on June 10, 1863, at Rector's Cross Roads, near Rectortown, Virginia, when John S. Mosby formed Company A of the battalion.Mosby was acting under the authority of General Robert E. Lee, who had granted him permission to raise a company in January 1863 under the Partisan Ranger Act of 1862, in which the Confederate Congress authorized the formation of such units.By the summer of 1864, Mosby's battalion had grown to six cavalry companies and one artillery company, comprising about 400 men.