Engelhardt participatated in the Austrian campaign and was wounded by shrapnel at Austerlitz. In the 1808-1807 campaign in Prussia and Poland, he was wounded by a bullet in his right leg at Eylau, and at Friedland was badly wounded by shrapnel in his left thigh, left side, and left arm. He was awarded the Order of St. George, third and fourth class, for his distinguished service.