That book linked to above...
Mmmrm yeah, it wasn't that expensive when I bought my copy at the Fort Ligonier museum shop a few years ago. The digital edition for Kindle is only $15. Too bad you can't buy it in PDF format or find the text on line for free.
My copy is currently out on loan, so I'm writing from memory. It's a quality trade paperback, printed on better-than-pulp paper, but production is not lavish. There are not many illustrations, none in color. There's an Osprey for that; Rene Chartrand's three-volume Colonial American Troops 1610-1774 covers the subject to my satisfaction. There are a couple of unspectacular maps that complement the text well, one of the Forbes Road, another if I recall of Fort Ligonier at the crossing of Loyalhannah Creek, but no tactical maps of specific engagements...might be one of Grant's Massacre, come to think of it, but it only shows the basic topography and deployments. There are no formal tables of organization.
There is a ton of OB information in the body of the text, on the order of (paraphrasing), 'On July 18 200 men of Poultron's Pennsylvania battalion marched 15 miles from Stinking Creek to Felcher's Bottom. Upon arrival they built a fortified camp and began constructing the road from Stinking Creek. Five days later on July 23, as the road to the Bottom neared completion, 170 men of Didleigh's Virginia Battalion marched on to a new advanced camp on the edge of the Depressing Swamp. On July 30, 200 North Carolina provincials under Captain Dimwittie reached Bouquet's main base at Raystown, but were sent home after two days because of their lack of arms and revolting personal hygiene habits..."
This is the first and only account of the campaign I have read that gives day-by-day and point-to-point details of troop movements and their occasional brushes with the French and Indians, beyond Francis Jenning's original lurid tale of Grant's Massacre. There's a very detailed account of the big F&I raid on Fort Ligonier.
You can certainly wargame the Forbes Campaign without a copy of The British Defeat of the French in Pennsylvania. I'm glad I found a copy, and my pals are lined up to read it.