Battle of Bunker Hill: Yankees Prepare to Fight on Breed's Hill. On June 16, 1775, on the heels of the Battles of Lexington and Concord that kicked off the Revolutionary War, American troops learned that the British were planning to send troops from Boston to occupy the hills surrounding the city.
To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
