2 Grenadier opened small arms fire but it was not very effective. Within the first 10 minutes, there were nearly 70 dead and scores wounded in the open on the pass. Within half hour, Chinese artillery opened up on the pass as well as in the depth areas but it failed to do much damage due to lack of observation.
The Indians sought artillery fire. Because of excellent domination and observation from Sebu La and Camel's Back, the officer say, artillery fire was most effective. Most Chinese bunkers were destroyed and the Chinese suffered very heavy casualties that by their own estimates were over 400. The artillery duel carried on day and night.
For the next three days, the Chinese were taught a lesson. On Sep 14, the Chinese threatened use of air force if shelling did not stop. By then, the lesson had been driven home and an uneasy ceasefire came about.