Khalid bn Walid, Sad bn Abi Waqqas, Hamza bn Abdul Mutallib, Amr bn Al Aas, Salahudeen al Ayyubi. (radiallahu anhum).
None of this men became heroes of Islam by killing innocent Women and Children, rather they became heroes by defending Islam against those who sought to destroy.
Salahudin al ayyubi displayed more mercy to Christianity than Paul or any of the disciples of Jesus.
These men became heroes by answering the call of jihad to fight and defend those weak and oppressed whose cry was;
“OUR LORD! Rescue us from this town whose people are oppressors; and raise for us from You one who will protect, and raise for us from You one who will help.”
O Allah, rectify the affairs of the Boko Haram (if indeed they are responsible) or destroy them.