The Salem marker identifies the North Bridge as the scene of an armed confrontation nearly two months before Lexington and Concord. By early 1775 Massachusetts Patriots had removed gunpowder and cannon from places where royal officials might seize them. General Thomas Gage, the military governor in Boston, used secret expeditions to recover provincial stores before they could support rebellion. Information that cannon were being prepared at Salem led him to dispatch troops under Lieutenant Colonel Alexander Leslie.

On Sunday, February 26, about 240 to 300 soldiers of the 64th Regiment sailed from Castle William and landed at Marblehead. They marched toward Salem with muskets loaded and bayonets fixed. The Sabbath timing may have been intended to preserve surprise, but riders carried the alarm ahead. Residents began moving the suspected cannon, while militia and townspeople gathered. Obstacles at the South River and crowded streets slowed the column as it proceeded toward the North Fields.

At the North River drawbridge, locals raised the span and denied passage. Owners also scuttled boats that Leslie considered using to cross. Men on both sides carried weapons, and sharp exchanges made violence seem possible. Salem militia officer Timothy Pickering, merchant Richard Derby, Captain John Felt, and other citizens resisted the search, while minister Thomas Barnard attempted to mediate. The colonists argued that the bridge led along a private way and could not simply be commandeered.

As darkness approached, the parties reached a face-saving compromise. The residents lowered the draw, Leslie marched his men a short distance beyond it, and the regiment then turned back without finding the cannon. No shot was fired and no one was killed. Yet the British mission had failed in the face of organized, armed resistance. The soldiers returned through a hostile crowd to Marblehead and reembarked for Boston.

The event became known as Leslie's Retreat or the Salem Gunpowder Raid. It revealed both the colony's readiness and the narrow margin separating protest from war. Local communication moved faster than a military column; civilians used knowledge of bridges and property; and negotiation prevented bloodshed while allowing each side to claim restraint. When Gage sent troops toward Concord on April 19, the resulting alarm produced the open fighting that Salem had narrowly avoided.

The marker calls this the first armed resistance to royal authority in the Revolution, a commemorative claim that emphasizes the participants' resolve rather than an exchange of fire. Its strongest value is not competition over which town "started" the war. The bridge site shows escalation in process: secret military orders, hidden weapons, militia mobilization, civilian crowds, and an improvised settlement. Remembered today, the peaceful ending is as historically important as the danger, demonstrating that armed confrontation did not yet make bloodshed inevitable.