I think it 3. Black Plague
That they were advanced enough to do metalworking, and that they had access to bronze ore.
It was the fertile soil and the land that attracted people.
Answer:
The photo is blurry i an ssee the questions
They attacked only at night under the cover of darkness. Their tactic was to engage in small skirmishes in the South Vietnamese countryside where they were familiar with the area. They used guerilla warfare and had their trip wires and pits with sharpened bamboo stakes to demobilize the enemy. After the battle, they escaped back to the jungle.
