Originally posted by: deepikagupta9
Krishna already defeated jarasandh 18 times but he wanted permanent solution that's with his plan bheem killed jarasandh.
Draupadi Swayamvar was a crucial point where Arjuna and Bhima had defeated different kings, Bhima had uprooted a tree for Arjuna’s protection, this is where Krishna witnessed their power, Krishna didn’t need an army to kill Jarasandha, He asked Yudi to send Bhima and Arjuna with him -
Policy exists in me. Power exists in Bhima. Valour exists in Arjuna. O king! We will overcome him like three fires. If that lord of men is confronted by the three of us alone, there is no doubt that he will engage one of us in a duel. Out of contempt for the worlds and his pride in himself, he will certainly challenge Bhimasena to a duel. The mighty- armed and immensely strong Bhimasena is his match, like death is of the worlds that confront their destruction. If your heart knows and if you have confidence in me, then, without losing any more time, entrust Bhimasena and Arjuna to me.”’
Krishna or Pandavas didn’t take any army with them