Surprised? Many of us don't know that Shri Krishna vowed to not to use a weapon in Mahabharat war, but he did use them couple of times. you will wonder that what were the occsasions. well, one was against Bhishma when he lifted the wheel of the chariot and the second time he actually used his Sudarshan chakra. This culminated in the killing of a warrior from Kaurava's side. Read the following articles to know more:
First incident of Shri Krishna using a weapon
Second incident of Shri Krishna using a weapon
First incident of Shri Krishna using a weapon
Second incident of Shri Krishna using a weapon