The man who saved jamestown from failure in its early days was?

John Smith

Explanation:

John Smith was an English explorer and writer that established the colony of Jamestown in Virginia. He was very famous because Jamestown faced several problems such as drought, harsh winters, famine, thirst, and diseases.

John Smith was important because he faced each problem of the colony with a different approach, he also helped to remove the colony president Edward Wingfield from office and assigned a new president, with this they could help and save the colony.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

c. troops marched forward in close formation against newer, more accurate weapons