In a previous verse the Lord promised to show Arjuna things he would by very interested in seeing. Now Arjuna sees that the leaders of the opposite party (Bhisma, Drona, Karna and all the sons of Dhrtarastra) and their soldiers and Arjuna's own soldiers are all being annihilated. This is an indication that Arjuna will emerge victorious in battle, despite heavy losses on both sides. It is also mentioned here that Bhisma, who is supposed to be unconquerable, will also be smashed. So also Karna. Not only will the great warriors of the other party like Bhisma be smashed, but some of the great warriors of Arjuna's side also.