According to the purchased information on the robots, the machines are equipped with integrated automatic rifles, they have only opened fire on people who "trespassed" onto certain distinct Old World buildings (described as large concrete structures with heavy metal security doors built into the mountain side) along the trail or attacked the machines first, they have treads and multiple red-glass sensors.

The exiles go to sleep without incident that night...

DAY 79

The morning comes with good weather. Sean continues to recover, but Richard is still ill.
Come midday, the exiles receive news from their radio operators that the delivery trucks have all finally arrived at their destinations and dropped off the orders.
Everything looks all clear on that front.