Final answer:
The first battle of the Philadelphia Campaign, the Battle of Brandywine Creek, took place during the American Revolutionary War. General Howe and his British troops defeated Washington's soldiers and captured Philadelphia, forcing the Continental Congress to flee.
Step-by-step explanation:
The first battle of the Philadelphia Campaign took place at the Battle of Brandywine Creek during the American Revolutionary War. In August 1777, General Howe and his British troops defeated Washington's soldiers in this battle and went on to capture Philadelphia, forcing the Continental Congress to flee. The British occupied Philadelphia during the winter of 1777-1778, while Washington's army camped at Valley Forge.