http://en.wikipedia.org/wiki/File:Battle_of_Brooklyn.gif (Map) http://en.wikipedia.org/wiki/File:Battleoflongisland.jpg (Battle Scene)

Once King George III, received the Delcaration of Independence he was very angry. The King sent instructions by letter  to  General William Howe  of the army and  Admiral Richard Howe of the  navy who were already in the Colonies to gather forces (Approximate number of British & Hessian-22,000 men) and 400 battle ships to take control of the  lower  part of New York Colony. The area was called   Long Island and King George  III knew that if this strategic  area  and New York city were under British control,  the  Northern and Southern Colonies would not be able to communicate with each other and  the fight for independence would fail. 

Once General George Washington learned about the  British plans, he knew how important it was to fight them and keep  control of  New York City and Long Island. On August 27, 1776, troops( Approximate number-19, 000)  were sent to Long Island and  were positioned on a  series of hills. 

General William Howe landed his British troops and German Hessians  on Long Island  and cannons from the battle ships smashed the American camps on the hills(one hill was named Battle Hill) with cannonball fire. He was able to divide the American Army in two and captured one part of it.