The Gītā is spoken between two armies. Its whole argument ends with a warrior ready to fight. It is easy to call it a war book.
Yet one word keeps coming back: ahiṁsā. Non-injury. Non-violence.
It appears four times. At 10.5 it is among the qualities that come from Kṛṣṇa himself. At 13.7 it is listed as a mark of true knowledge. At 16.2 it stands among the divine qualities a person can be born with. At 17.14 it is part of the discipline of the body.
The same teacher who tells Arjuna to fight never takes ahiṁsā off the list. He does not ask for a man who enjoys force. He asks for a man who can carry duty without cruelty, and who knows the difference.
The strongest person in the Gītā is told to stay gentle.
Going deeper
The Gītā is spoken between two armies, yet it keeps coming back to non-injury. 16.2 is one of the clearest places. It sits in a list that begins at 16.1 with fearlessness and purity of mind, and it names non-injury, truth, freedom from anger, renunciation, tranquillity, not slandering others, compassion for all beings, freedom from desire, gentleness, a sense of shame and freedom from fickleness. 16.3 ends the run with grandeur, patience, fortitude, purity and freedom from hatred and from pride, and says these belong to one born to a divine destiny. Non-injury, ahiṁsā, is also named at 10.5, among qualities that arise from Kṛṣṇa, at 13.7, in a list that begins with modesty, and at 17.14, as part of the austerity of the body. It never stands alone. It is always one item among others. See chapter 16 and what the Gītā says about anger.