Islamic Battles / Ghazwa

The verse of Tayammum (dry ablution) was revealed during Battle of Banu Al-Mustaliq, stating the importance of prayer and drawing attention to its great status. The absence of water, which is the means of purification (and purification being the major condition of prayer), does not prevent one from performing it

Hazrat Hamza (RA) was martyred by Wahshi ibn Harb during the Battle of Uhud.