How did the military affect the fall of Rome?
Invasions by Barbarian tribes
The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders
Explanation:
For there were alot of places to carry the disease for bad living conditions
When Muhammad was somewhere around the age of eighteen, he was bothered by the idolatry and materialism he saw around him, so he went into a cave every day so he could meditate. One day, an Angel named Gabriel appeared to him, saying that his opinions were correct. Gabriel also wanted Muhammad to become the first prophet and gave him the task of bringing Islam to the world. I hope I answered your question.