General Gage, commander of British forces in Boston, began preparations for an upcoming conflict with the colonists by secretly planning to send troops to Concord to seize a cache of weapons. Paul Revere and other colonial spies learned of the plan and prepared to warn their fellow colonists. Tensions were mounting as both sides readied themselves, with the British collecting intelligence from the top down and the colonists organizing from the bottom up. General Gage underestimated the strength of colonial leadership which would prove disastrous in the coming events.