According to the July 16 entry, why do the two men stop their wagons? What happens
to them?

read below that should be enough to get you our answer

Explanation: Just after we crossed the bridge, and where there is a sudden turn in the road, as it winds around the mountain, we saw where two men had been killed and two wagons burned last week. The tire became loose on a wheel of the next to the last wagon in a freight train, the men stopped to tighten it, while the rest of the train moved on, not thinking of danger, and was out of sight in a few minutes. An hour later some of the men came back to see what kept them. There they were - dead and scalped - horses gone, and wagons on fire. The Indians had taken all the freight they could use, piled wood under the wagons, and set it on fire. We saw quantities of white beans scattered over the ground, also the irons from the wagons."

gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.