He re-enlisted on April 14, 1759, for the campaign of the Second Connecticut Regiment under Colonel Nathan Whiting and was a member of David Baldwin's Third Company.

He served in the French and Indian War from 1755 to 1760 and was in the Battle of Lake George where he witnessed the death of his uncle and cousin.

They had twelve children, all born in Kent, New York, (then known as Philipse Upper Patent) and raised the family on a 229 acre farm.

[5] He was affiliated with George Washington's intelligence in the American Revolutionary War;[3][4][8] the military commander Nathaniel Sackett asked Ludington for help to furnish spies in Dutchess and Westchester Counties, New York, to gather information on British activities.

[3] Ludington collaborated with Enoch Crosby, an American Revolutionary War soldier who worked in the same territory.

[12] His daughter, Sybil Ludington,[13] has received widespread recognition for her role in a horseback ride to alert her father's Minute Men troops to meet the British army.