During the wars with the Muscovites, Filon Kmita was the head of a small unit of 200 hussars. It is believed that the unit consisted of battle-hardened and heavily armored 140 hussars and 60 Cossacks. Introduction to the unit was based on the skill of the soldier, rather than the soldier's ethnicity or religious beliefs. Kmita's unit consisted of not only Lithuanians but also Poles and Ruthenians.
Once Kmita captured the city of Orsha, he made it the center of his intelligence operations, which he would use to receive information about the movement of Tatar or Muscovite units. A part of the useful information Filon Kmita would receive, he would simply buy or receive it from deserters, merchants, or various others travelers. Such useful information via secret letter Filon Kmita would send back to the Lithuanian Council of Lords as well as the rulers of Lithuania, Poland, and the most notable of nobles at the time. Since around 30 of these letters have survived, we know some names, or perhaps pseudonyms, of certain agents of his. Kmita's agents also assisted in the rescuing of certain Lithuanian soldiers to break free from the prison and get to Orsha.
Kmita's network also developed a sophisticated messaging system. Operators on the border of the nation were instructed to periodically check an isolated singular spruce tree - if the second branch from the bottom was broken - it meant the Muscovites are organizing a war expedition against the nation. Likewise, if the branch was not broken, then the message was to remain calm for now.
It is said that Kmita's unit created an unusual version of telling whether someone was telling the truth. The interrogated person would have their mouth filled with buckwheat flour, and if the flour remained dry, the person was supposedly lying.
Some have theorized that it is thanks to Kmita's agents that the Muscovite dissident and duke Andrey Kurbsky entered the Lithuanian side. Kmita himself wrote some letters to Tsar Ivan the Terrible dedicated to further incite paranoia among the enemy circle, which also according to the theory supposedly lead to the sack of Novgorod.