9 April] Tsar Alexander I instructed Chicagov to use his army to attack Napoleon's rear and force Austria out of the war by encouraging a Slavic revolt and advancing to the Adriatic Sea.
These plans were abandoned due to diplomatic communications between Russia and Austria that revealed that the Austrian contribution to the invasion would be limited to 30,000 men.
It included the following units:[2] The army fielded 57,500 men in 74 battalions, 64 squadrons, fourteen irregular cavalry regiments, and twenty artillery companies on 17 July [O.S.
19 July] and arrived there in September after a 52 day-march to the Styr River, leaving behind elements to cover the border.
31 August] the army included 43,600 men in 71 battalions, 64 squadrons, ten irregular cavalry regiments, and eighteen artillery companies.