1.) They had the French on their side.
2.) Guerilla Warfare.
Guerilla Warfare is a sort of petty type of combat - they ambush, use sneak attacks, etc.
because It took many people to share the high costs.
Montgomery bus boycott, mass protest against the bus system of Montgomery, Alabama, by civil rights activists and their supporters that led to a 1956 U.S. Supreme Court decision declaring that Montgomery's segregation laws on buses were unconstitutional. The 381-day bus boycott also brought the Rev.(Britannica.com)
The Sphinx, hope this helps ❤