How did George Washington's policy toward African Americans change during the war?

At first Washington refused to accept African American soldiers, but when the British offered freedom to enslaved people, He changed his policy by accepting African American soldiers for the war.

Source: Prentice Hall AMERICA HISTORY OF OUR NATION

p.s. I know you guys are not doing your homework *coughs* *says Mr. Danish's HONORS class under his breath*

-Anonymous