Burgoyne was forced to surrender at Saratoga because he was surrounded and cut off from his base of supplies.

Burgoyne 被迫在萨拉托加投降，因为他被包围并被切断了与补给基地的联系。

It was nearly three thousand miles from the main base of supplies and, though the British navy kept the channel open, transports were constantly falling prey to daring privateers and fleet American war vessels.

它距离主要补给基地近三千英里，尽管英国海军保持航道畅通， 但运输不断成为大胆的私掠船和美国舰队的牺牲品。