Rubuta ci gaba don wannan sakin layi - Tun daga ƙuruciya Koniecpolski ya zaɓi ya bi aikin soja. A cikin 1610, tare da ɗan'uwansa Przedbór, ya shiga cikin Dymitriads da Muscovy, yana tara rukuni na maza 300 don shiga cikin Sojojin Poland-Lithuanian Commonwealth a Smolensk. A ranar 4 ga Yuli 1610 ya shiga cikin yakin Klushino.
kafin shiga Siege na Smolensk inda Przedbór ya murƙushe har ya mutu ta hanyar rushewar ganuwar sansanin soja a ranar 8 ga Yuli 1611. Bayan ya koma gidan danginsa a Koniecpol tare da gawar ɗan'uwansa, kaka mai zuwa Koniecpolski ya koma soja. A karkashin umarnin Grand Lithuanian Hetman Jan Karol Chodkiewicz, ya shiga cikin kokarin sauƙaƙewa da wadatar da sojojin Poland da aka kewaye a cikin Moscow Kremlin. A wannan lokacin, Hetman ya amince da shi tare da umurnin dama na sojojin Poland.