system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] - How did the freeman bring jihad to so many people and planets with so few soldiers?

In the first book they estimate the freeman population at 5 million. In the second book it is said the hundreds of planets were conquered over 12 years causing the deaths of over 60 billion people. I find it hard to fathom that so few could conquer so many is such a short time, no matter how blood thirsty and tough they may be. Is there something I'm missing? I mean there were more combatants in World War 2 than the entire freeman population.
gpt
Remember that Paul had prescient abilities and knew that the only way for things to move forward was to be bloodthirsty and ruthless. With his power, he guided his Fremen soldiers to planets where they would be most effective. With the ability to see the future, he could have easily struck vulnerable targets and left before a response arrived. 

It wouldn't take long for many Houses and armies to surrender after enough attacks of that nature. Some were indeed exterminated completely.

Also, Paul saw through his visions that the jihad would spread Fremen culture to various planets, which could have swelled the ranks of soldiers over time.