Burgoyne's plot to capture supplies at Bennington was quite the gamble. He risked about 750 of his troops, or 1/10 of his total force, on a distraction. Burgoyne was an experienced gambler, and according to historian and author Douglas Cubbision "like all experienced gamblers, Burgoyne did not hazard anything on this expedition he could not afford to lose... it employed those elements that he could afford to lose without appreciably harming his primary army, or endangering the principal objective of the campaign."
Burgoyne, J., & Cubbison, D. (2012). Burgoyne and the Saratoga Campaign: His papers. Norman, Oklahoma: The Arthur H. Clark Company, an imprint of the University of Oklahoma Press.