Why was asoka's first military campaign also his last?

Asoka's first military campaign, the Kalinga War, was a turning point in his life due to the immense bloodshed and suffering caused. Witnessing the devastation and loss of life led Asoka to embrace Buddhism and adopt a policy of non-violence and compassion. As a result, he renounced war and focused on promoting peace and welfare through his rule, making the Kalinga War his first and last military campaign.