Explanation

Hazrat Hamza (RA) is historically credited with raising the flag in Ghazwa. Hazrat abu Salman (RA) is not specifically mentioned for this action. Hazrat Umar (RA) was a prominent figure but not noted for first raising the flag there. Hazrat Saad bin Maaz (RA) is another companion, but the record points to Hamza (RA).