From "Genealogical and Memorial History of the State of New Jersey"
by Francis Bazley Lee in 1910 ...

Page 132

quote

Henry Lake Gilmour, founder of the family in this country, was born in
Londonberry, Ireland, and came to this country with Captain Lake.

unquote

Paraphrasing, Henry Lake Gilmour settled in Cape May, NJ, established
a successful business as a carriage painter, and enlisted in the First
Regiment of New Jersey Cavalry at the outbreak of the Civil War.