On May 27, 1813, he was appointed a cadet in the Life Guards Dragoon Regiment, and immediately took part in the War of the Sixth Coalition against Napoleon.
Two years later, at his own request, he was transferred with the rank of lieutenant to the Mitavsky Dragoon Regiment, in which he served until March 17, 1820, when he retired due to illness.
On December 3, 1842, Englehardt was awarded the Order of St. George, fourth degree, in recognition of his 25 years of irreproachable service as an officer.
On June 25, 1845, Englehard was promoted to Major General, and on February 6, 1847, was appointed commander of the 2nd Brigade of the 1st Currasier Division.
His brother Basil was also a lieutenant general and commander of the Life Guards Dragoon Regiment and later governor of Kovno.