It was George Washington biggest defeat. He was forced to retreat to out of New York.
Battle of Brandywine
The patriots did an ambush attack. They ended up winning with only 5 men lost and the British lost more then 1,000 total
Battle of Saratoga
George Washington went on the offensive and attacked. The other battles he had been retreating but he flank the British and won the battle
summary
Washington was trying to protect Philadelphia but failed it was a long and bloody conflict and America lost the winning streak and a bunch of men.
This battle was the turning point because this victory persuaded foreign country's specifically France to ally with the Americans
The Americans suffered their biggest lost in the battle of long island being forced to retreat out of New York. After the Americans ambushed the British around Christmas and won the battle of Trenton with that surprise attack making the British lose a big amount of men. In the battle of Princeton George Washington flanked the British instead of retreating and won. In the battle of Brandywine Washington was trying to protect Philadelphia from being captured but failed. And the battle of Saratoga was the turning point and we allied with France and won.