Born into a military family[1] around 1745,[2][note 2] Mittrowsky joined the Habsburg army at an unknown date and served as Oberst (colonel) of the Callenberg Infantry Regiment Nr.

[6] At the Battle of Famars on 23 May 1793, Mittrowsky led the Callenberg regiment in the 1st Main Column under Prince Frederick, Duke of York and Albany.

[1] During the first relief of the Siege of Mantua, he led a brigade in Feldmarschall-Leutnant (FML) Paul Davidovich's III Column which had a total strength of 8,274 infantry, 1,618 cavalry, 32 position guns, and 8 howitzers.

[17] After army commander FZM Jozsef Alvinczi reached the Brenta with the Friuli Corps, Mittrowsky moved to join its right wing.

[18] After heavy fighting in the Second Battle of Bassano on 6 November 1796, Mittrowsky's brigade, which numbered about 3,000 men, was still coming up in the rear of Alvinczi's main body.

On 16 November, Alvinczi entrusted Mittrowsky with 14 infantry battalions and 2 cavalry squadrons from the brigades of Oberst Franz Sticker and GM Anton Schübirz von Chobinin.

Alvinczi instructed him to attack at dawn, in conjunction with a second column under FML Giovanni Marchese di Provera; they were to drive the French back to the Adige.

Mittrowsky then capably defended Arcole, and his troops repulsed repeated French attacks for the remainder of the day.

[22] On 17 November, after heavy fighting all day, the French finally captured Arcole at 5:00 pm and Mittrowsky withdrew his troops to San Bonifacio.

[23] Mittrowsky missed the Battle of Rivoli in January 1797, being employed in guarding the Valsugana with a brigade consisting of 3,497 infantry and 73 cavalry.

[24] The outbreak of the War of the Second Coalition found Mittrowsky serving in the army of Italy under FML Pál Kray.

[25] At the Battle of Magnano on 5 April, Mittrowsky led a brigade in FML Karl Mercandin's division consisting of Infantry Regiments Nr.

Mercandin was killed at Magnano[27] and the division was subsequently led by FML Konrad Valentin von Kaim, but the source does not say if Mittrowsky served at the Battle of Cassano.

[29] During the Battle of Novi on 15 August 1799, Mittrowsky fought with the left wing under the overall supervision of FZM Michael von Melas.

[35] During the period 1806–1809, he was deputy to FML Johann I Joseph, Prince of Liechtenstein, the commanding general in Upper and Lower Austria and Salzburg.