All of Great Britain’s concerns about the rebellious colonists were focused on Boston, viewed as the center of agitation and potential additional conflict. Thomas Gage, appointed Royal Governor of Massachusetts just one year earlier, understood that Boston was a test and his appointment required controlling the revolutionary forces swelling in the seaport town. He had attempted to enforce Britain’s taxes and other punitive legislation unsuccessfully, even though of the 7,000 British redcoats in the colonies, more than 4,000 were quartered in Massachusetts alone. Now he feared that control was being lost.

He was correct.

By April 1775, Gage believed his only course of action was disarming the opposition by seizing their stockpiles of munitions, housed in the armory in Concord. He called for British regulars to assist in the seizure, but the Sons of Liberty learned of his plans and began preparing their defense. Paul Revere, Samuel Dawson, and others had spread the alarm “though every Middlesex village and farm” after learning that troops were preparing to march toward Lexington and Concord.

The Lexington militia — mostly farmers and tradesmen — were led by John Parker, a seasoned military veteran who had fought during the French and Indian War and in the 1759 Battle of Quebec. While the minutemen may have appeared to be a “rag-tag, undisciplined force,” the opposite was true.

No, they did not have colorful and well-kept uniforms needed for military parade, and they did not regularly stand in formation for review. Yes, they generally served only for a few months at a time, and they were seldom deployed for long engagements, even during the earlier conflict with the French. However, they were motivated by their love of liberty and their commitment to neighbors standing alongside. Additionally, they were certainly more skilled at frontier fighting and quick decisive maneuvers instead of the laborious march and line formation favored by the Brits.

As the British troops moved out of Boston toward Lexington and then Concord, they had no idea what awaited them.

About 80 militiamen were posted at Lexington, and John Parker’s plan was to use his Lexington militia to delay the British while his counterpart, Colonel James Barrett, garnered the Concord volunteers to prepare for combat. Barrett’s troops swelled from the initial 300 to more than 3,500 troops as men arrived from other towns and farms, stretched out between Lexington and Concord. These farmers and tradesmen were not going to surrender their arsenal without a fight.

The British light infantry marched forward under the command of Major John Pitcairn. In Lexington, they encountered Parker’s men, who stood armed in parade formation, hoping the suggestion that opposition awaited would stall the attack. Pitcairn knew his platoon was outnumbered and called for his men to disperse in preparation for retreat until additional troops could be brought forward.

Instead, a shot rang out from an unknown site even though both sides had ordered a “no fire.” The British responded with fixed bayonets and charged forward while laying a volley of shots into the minutemen. Eight minutemen died and 10 others were wounded, but the significance of the day had just changed.

British Lt. Colonel Francis Smith arrived with forces and realized that Pitcairn’s men were in disarray. After taking command, he pushed his redcoats toward Concord with orders to move swiftly, knowing the minutemen would be preparing a stronger defense now that they had lost friends in the opening volley.

Colonel Barrett decided to move his troops to the North Bridge instead of waiting in the town. A skirmish occurred at the “rude bridge that arched the flood,” and the British, realizing they were outnumbered and witnessing even more minutemen gathering in the distance, chose to retreat to Boston. Suffering repeated ambushes and sniper attacks along the retreat that targeted specifically the officers, the British forces crumbled and beat a hasty and unorganized rush from Lexington.

Fortunately for the British, BG Hugh Percy and a brigade of redcoats met the disorganized troops on the road, gained control, and left the field. Plagued with repeated sniper attacks, Percy’s forces remained organized, and as they returned to Boston, their anger and humiliation resulted in atrocities committed against local families.

While the battles at Lexington and Concord were not significant colonial victories on the field, they were monumental for morale. Instead of a revolt against local authorities, the movement had become a revolutionary struggle for independence. Within two days, more than 15,000 volunteers from across New England had assembled around Boston, awaiting the next encounter.

They would not have to wait too long.