Why did Stannis burn his daughter Shireen?

Stannis Baratheon burned his daughter Shireen as a sacrifice to the Lord of Light, believing that it would grant him victory in his campaign against the Boltons. Faced with dire circumstances, including dwindling supplies and a harsh winter, Stannis was convinced that the act would appease the deity and turn the tide in his favor. This tragic decision highlights Stannis's desperation and moral decline, reflecting the extreme measures he was willing to take for power.