Oleg Palchyk
- Mortar platoon commander Olga Bigar is better known in Ukraine by her callsign "Witch."
- Bigar was thrust into the fighting almost immediately after volunteering last year.
- Now helping defend Bakhmut, she told Insider of her journey from civilian to fighter.
Ukrainian officer Olga Bigar will not tell anyone how she received the callsign "Witch" until the war is over.
"But when I am asked," she says with a grin, "I say it's because I can set the sky on fire."