Bhagavad Gītā Chapter One verse 1

dhṛtarāṣṭra uvāca |
dharmakṣetre kurukṣetre samavetā yuyutsavaḥ |
māmakāḥ pāṇḍavāś cāiva kim akurvata saṃjaya ‖

dharma - essential qualities; highest dutykśetra - the field

Commentaries and Reflections

Paul Harvey:

Bhagavad Gītā Chapter One Verse 1 sets the story on the field of Dharma.
Dharma is how we act in relation to the present moment and is a product of our KarmaKarma is a force coming from past memories.
Thus Arjuna’s Dharma becomes confused because of his Karma.