What was the name of the battle that was fought near Boston on June 16, 1775? The British advanced and retreated twice, and finally succeeded on the third attack. However, of the 2,000 British soldiers, 1,000 were killed or wounded. This was the bloodiest battle of the war. This is the battle where Patriot Colonel William Prescott famously shouted, "Don't fire 'til you see the whites of their eyes!"