The Brandywine Battle isn’t the most popular topic of Revolutionary War discussion because even though we won the war, we lost this one. The Americans were forced back towards Philadelphia.
The British lost 93 men and suffered 488 wounded men (four of them drummers). Of the casualties, 40 were Hessians aiding the British. There is no official total for the American side. The best guess is around 1,000 men were killed, wounded or taken prisoner. (And Washington noted that 315 men deserted).
The battle may have been lost by Washington’s mistakes but the British lacked enough cavalry and most of the American army was able to escape. In his report to the Continental Congress on the battle, Washington wrote: “Despite the day’s misfortune, I am pleased to announce that most of my men are in good spirits and still have the courage to fight the enemy another day.”