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June 17, 1775Reputable sourceWell documented

The Battle of Bunker Hill

On the timeline · around June 17, 1775 · The Battle of Bunker Hill1774177517761777

What happened

On 17 June 1775 British forces assaulted colonial fortifications overlooking Boston, in fighting centered on Breed's Hill. The British eventually took the ground but suffered heavy casualties against the entrenched Americans.

Why it matters

Though a British victory, Bunker Hill showed that colonial militia could stand and fight against regular troops, stiffening American resolve early in the war.

Sources