Final answer:
The battles involving Al-Biladuri were fierce due to internal power struggles within the Islamic community, the Arab-Muslims' effective fighting capabilities, and the vulnerability of neighboring weakened empires.
Step-by-step explanation:
The student asks for reasons why the battle involving Al-Biladuri was fierce. Although there is no specific battle named after Al-Biladuri in historical records, the mention of early Islamic civil wars and the struggle for the caliphate suggests that the question likely refers to the conflicts during the expansion of Muslim rule or events surrounding the Fitna, the first Islamic civil war. The fierceness of these confrontations can be ascribed to several factors:
- Internal strife and power struggles within the rapidly expanding Islamic community, specifically after the murder of the third Caliph Uthman and during Ali's caliphate, resulting in political upheaval and the outbreak of the First Fitna.
- The determination of the Arab-Muslims as a fighting force and their highly mobile warfare techniques, aided by the use of horses and camels to rapidly deploy and attack.
- The external opportunities presented by the weakened state of the neighboring Byzantine and Sasanian Empires following their prolonged wars, which the Arab Muslims capitalized on.
Such internal and external pressures, combined with the strategic needs and desires for control over trade routes and resources, made the battles of this era exceptionally fierce.