I've been searching for Hubbard ancestors who fought in the French & Indian Wars and the Seige of Louisburg, Cape Breton, Nova Scotia. One of the few places I have had any luck is in the appendix of the book, "History of the Indian Wars in New England" by Samuel Gardner. It's an old book but available as a free EBook from Google.com/books.
Near 4,000 colonial troops beseiged Louisburg and Maine contributed almost 1/3 the total troops. Jonathan Hubbard was appointed a Capt. in Lt.Col.John Bradstreet's company of Pepperell's Regiment. He was appointed on Oct.2,1745 by Massachusetts Governor Shirley.
The records of many of the men who fought at Louisburg have been lost or mislaid either in Massachusetts or in London or both. I know from Maine records of two other Hubbards from Berwick who fought there but have not, as yet, been able to verify Capt. Philip Hubbard or his son, Lt.Philip Hubbard, Jr. Note the ranks were pre-American Revolution. Philip Hubbard, Jr. served as a Captain in the Mass.Colonial Militia from 1775 throughout the Revolutionary War.
If your are seeking to document service at Louisburg by a family member, check out this EBook.