Please Help!!

Source A:
“On Friday night, a body of near or quite a hundred fell upon those living along the great road between this place and Pennsylvania, and killed or took fifteen more. The mischief would have been much greater, had not an officer and twenty men of the regiment, who were then out, fallen in with and engaged the enemy…. Our party killed on Indian, whose scalp they obtained, and wounded several others.”

George Washington, writing to Colonel Stanwix, detailing an attack of Native Americans on English settlers in West Virginia.

1. How does Source A represent a cause of the French and Indian War?